Dotted around the Unova region, there are numerous people who will open up and tell you certain stories about the past few years which help give some backstory to their motives or find out what they have been doing in the two years between Black/White and Black 2 & White 2.

• A Triple Team: In the Striaton City Restaurant, listen to Cilan, Cress & Chili's emotions. - Receive Trio Badge in BW
• Different Bones & Dreams: At the NacreneCity Museum, listen to what Bone Specialist Lenora has to say.. - Receive Quake Badge in BW
• Hearts' Desire: At a certain building with a frozen floor in Icirrus City, Brycen awaits. - Receive Freeze Badge in BW
• A New Light: After entering the palace, Drayden is thinking of the past at Opelucid City. - Receive Legend Badge in BW
• Taking It To The Next Level: After arriving at Lentimas Town, in front of the Mistralton City Gym, Skyla wants to talk about her worries to someone. - Receive Jet Badge in BW
• White And Black: After you first enter the Pokemon World Tournament, at a certain EX-Team Plasma member's house in Driftveil City, a certain somebody has arrived... - Defeat N and Ghetsis in BW
• Farewell Beloved Sister: If you have obtained Musical Props in Black & White and use the Memory Link feature in Black 2 & White 2 before you first enter the Pokémon Musical hall you will get a history of the Musical and about how the Prop Case was dropped - Compete in Pokémon Musical and enter EntraLink once
• Meeting Friends, Saying Good-Bye: At the Pokemon Centre in Aspertia City, a Breeder is thinking about Pokemon. - Defeat N and Ghetsis in BW

Providing you have completed the main narrative in the Pokémon Black and White, you will start being able to encounter N's Pokémon within the various areas of the game. This follows on from one of the flashbacks where N is seen to release his Pokémon in Chargestone Cave.

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If you have obtained Musical Props in Black & White and use the Memory Link feature in Black 2 & White 2 before you first enter the Pokémon Musical hall, when you enter instead of giving you an empty Prop Case, the owner of the Pokémon Musical will tell you that a trainer once accidentally left his Prop Case in the Pokémon Musical Hall and he gives it to you. All the props that were obtained in Pokémon Black & White are stored in the case, meaning you don't have to re-obtain the props.

If you have helped Loblolly's to pick items for creation which end up within the Dream World within Pokémon Black & White, those items will carry over to your Dream World home if you chat to her in Black 2 & White 2.

Normally, if you haven't used the Memory Link feature, most mentions of the character who helped stop Team Plasma two years ago are listed as "a trainer". However, if you use Memory Link, the name of the character in the game is used instead. This is mostly noted in dialgoue from N, Bianca, Cheren, Professor Juniper and the previous character's mother as well as some people in various routes of Unova.

As for your room, if you've earned any certificates through Pokédex completion and any trophies through the Battle Subway within Black & White, they will appear within the trainer's home.

Unlocked Via: Defeat N & Ghetsis in Black & White
Location: Nuvema Town

If you have done the Memory Link feature, then as you ext Nuvema Town, Bianca will appear and state about how this was her first place of battle and where she set off on her journey, referencing the previous trainer. She will suggest battling you in memory of those times. She will use a team with Pokémon based on what she had in your version of Black & White

Pokémon Trainer Bianca	Stoutland	Chandelure	Musharna	Mienshao	Simisear	Samurott
Battle Type Single Battle Items	Level 63	Level 63	Level 63	Level 63	Level 63	Level 65
	Intimidate	Flash Fire	Forewarn	Inner Focus	Gluttony	Torrent
	Attacks: Ice Fang Surf Wild Charge Return	Attacks: Shadow Ball Psychic Overheat Return	Attacks: Yawn Dream Eater Psychic Return	Attacks: Drain Punch U-turn Fake Out Return	Attacks: Flamethrower Rock Slide Brick Break Return	Attacks: Aqua Tail X-scissor Aerial Ace Return
	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item
If Snivy Chosen in BW

Pokémon Trainer Bianca	Stoutland	Chandelure	Musharna	Mienshao	Simipour	Serperior
Battle Type Single Battle Items	Level 63	Level 63	Level 63	Level 63	Level 63	Level 65
	Intimidate	Flash Fire	Forewarn	Inner Focus	Gluttony	Overgrow
	Attacks: Ice Fang Surf Wild Charge Return	Attacks: Shadow Ball Psychic Overheat Return	Attacks: Yawn Dream Eater Psychic Return	Attacks: Drain Punch U-turn Fake Out Return	Attacks: Surf Rock Slide Brick Break Return	Attacks: Leaf Storm Dragon Tail Coil Return
	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item
If Tepig Chosen in BW

Pokémon Trainer Bianca	Stoutland	Chandelure	Musharna	Mienshao	Simisage	Emboar
Battle Type Single Battle Items	Level 63	Level 63	Level 63	Level 63	Level 63	Level 65
	Intimidate	Flash Fire	Forewarn	Inner Focus	Gluttony	Blaze
	Attacks: Ice Fang Surf Wild Charge Return	Attacks: Shadow Ball Psychic Overheat Return	Attacks: Yawn Dream Eater Psychic Return	Attacks: Drain Punch U-turn Fake Out Return	Attacks: Energy Ball Rock Slide Brick Break Return	Attacks: Flare Blitz Brick Break Wild Charge Return
	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item
If Oshawott Chosen in BW

Unlocked Via: Defeat N & Ghetsis in Black & White
Location: Route 5

If you have done the Memory Link feature, then as you enter Route 5 after defeating N, you will see Cheren his there. Reminiscing of his previous travels, he will challenge you to a battle, using his team from Black & White

Pokémon Trainer Cheren	Liepard	Unfezant	Haxorus	Gigalith	Simipour	Emboar
Battle Type Single Battle Items	Level 65	Level 65	Level 65	Level 65	Level 65	Level 67
	Unburden	Super Luck	Rivalry	Sturdy	Gluttony	Blaze
	Attacks: Fake Out Night Slash Shadow Claw Aerial Ace	Attacks: Air Slash Quick Attack Facade U-turn	Attacks: Outrage Rock Slide X-scissor Surf	Attacks: Stone Edge Stealth Rock Earthquake Giga Impact	Attacks: Surf Brick Break Payback Rock Slide	Attacks: Flare Blitz Head Smash Brick Break Wild Charge
	Hold Item: Sitrus Berry	Hold Item: Scope Lens	Hold Item: Dragon Gem	Hold Item: Leftovers	Hold Item: Mystic Water	Hold Item: Focus Sash
If Snivy Chosen in BW

Pokémon Trainer Cheren	Liepard	Unfezant	Haxorus	Gigalith	Simisage	Samurott
Battle Type Single Battle Items	Level 65	Level 65	Level 65	Level 65	Level 65	Level 67
	Unburden	Super Luck	Rivalry	Sturdy	Gluttony	Torrent
	Attacks: Fake Out Night Slash Shadow Claw Aerial Ace	Attacks: Air Slash Quick Attack Facade U-turn	Attacks: Outrage Rock Slide X-scissor Surf	Attacks: Stone Edge Stealth Rock Earthquake Giga Impact	Attacks: Energy Ball Brick Break Payback Rock Slide	Attacks: Hydro Pump Aqua Jet Blizzard X-scissor
	Hold Item: Sitrus Berry	Hold Item: Scope Lens	Hold Item: Dragon Gem	Hold Item: Leftovers	Hold Item: Miracle Seed	Hold Item: Focus Sash
If Tepig Chosen in BW

Pokémon Trainer Cheren	Liepard	Unfezant	Haxorus	Gigalith	Simisear	Serperior
Battle Type Single Battle Items	Level 65	Level 65	Level 65	Level 65	Level 65	Level 67
	Unburden	Super Luck	Rivalry	Sturdy	Gluttony	Overgrow
	Attacks: Fake Out Night Slash Shadow Claw Aerial Ace	Attacks: Air Slash Quick Attack Facade U-turn	Attacks: Outrage Rock Slide X-scissor Surf	Attacks: Stone Edge Stealth Rock Earthquake Giga Impact	Attacks: Flamethrower Brick Break Payback Rock Slide	Attacks: Leaf Storm Coil Dragon Tail Leaf Blade
	Hold Item: Sitrus Berry	Hold Item: Scope Lens	Hold Item: Dragon Gem	Hold Item: Leftovers	Hold Item: Charcoal	Hold Item: Focus Sash
If Oshawott Chosen in BW