Location: N's Castle

After defeating the Elite Four, you will be notified of a random Zoroark in Victory Road. Follow this Zoroark and you will enter the ruins of N's Castle. In there, N will join you as you travel to the throne room where he will challenge your strength using only his Dragon Pokémon

Pokémon Trainer N	Zekrom
Battle Type Single Battle Items	Level 70
	Teravolt
	Attacks: Zen Headbutt Fusion Bolt Dragon Claw Imprison
	Hold Item: No Item
Black Only

Pokémon Trainer N	Reshiram
Battle Type Single Battle Items	Level 70
	Turboblaze
	Attacks: Extrasensory Fusion Flare Dragon Pulse Imprison
	Hold Item: No Item
White Only

Once defeated, he will release his Dragon and you can capture it at the summit of Dragonspiral Tower

Location: N's Castle
Rebattle?: Yes

Long after this, after visiting him at the Ferris Wheel in Nimbasa on Fridays, you will be able to rechallenge N as he wonders about the previous game's Trainer and if he achieved his dream. The team N uses changes on subsequent rebattles and all focuses on a different type of weather and are based on the season. Spring he uses his Water-type team, Summer his Fire-type team, Autumn his Sandstorm-team and Winter his Ice-type team. The battles are incredibly tough, and the weather is set up instantly using the lead Pokémon's ability. He can be rebattled once a season

Pokémon Trainer N	Politoed	Lanturn	Tentacruel	Omastar	Kabutops	Starmie
Battle Type Single Battle Items	Level 77	Level 75	Level 75	Level 75	Level 75	Level 75
	Drizzle	Volt Absorb	Clear Body	Swift Swim	Swift Swim	Natural Cure
	Attacks: Hydro Pump Focus Blast Psychic Hypnosis	Attacks: Thunder Signal Beam Hydro Pump Stockpile	Attacks: Rain Dance Giga Drain Scald Barrier	Attacks: Rain Dance Hydro Pump Ice Beam Earth Power	Attacks: Stone Edge Aqua Jet X-scissor Low Kick	Attacks: Hydro Pump Thunder Psychic Ice Beam
	Hold Item: Life Orb	Hold Item: No Item	Hold Item: Damp Rock	Hold Item: Damp Rock	Hold Item: No Item	Hold Item: No Item
Spring Only

Pokémon Trainer N	Ninetales	Arcanine	Rapidash	Shiftry	Ninjask	Leafeon
Battle Type Single Battle Items	Level 77	Level 75	Level 75	Level 75	Level 75	Level 75
	Drought	Intimidate	Flash Fire	Chlorophyll	Speed Boost	Leaf Guard
	Attacks: Fire Blast Solarbeam Foul Play Confuse Ray	Attacks: Extremespeed Overheat Wild Charge Outrage	Attacks: Megahorn Drill Run Flare Blitz Solarbeam	Attacks: Dark Pulse Solarbeam Focus Blast Sunny Day	Attacks: Sunny Day X-scissor Solarbeam Protect	Attacks: Leaf Blade X-scissor Attract Iron Tail
	Hold Item: Life Orb	Hold Item: No Item	Hold Item: No Item	Hold Item: Heat Rock	Hold Item: Heat Rock	Hold Item: No Item
Summer Only

Pokémon Trainer N	Hippowdon	Gastrodon	Cradily	Armaldo	Scizor	Rhyperior
Battle Type Single Battle Items	Level 77	Level 75	Level 75	Level 75	Level 75	Level 75
	Sand Stream	Storm Drain	Suction Cups	Battle Armor	Technician	Solid Rock
	Attacks: Stone Edge Crunch Superpower Stealth Rock	Attacks: Earth Power Muddy Water Ice Beam Sandstorm	Attacks: Sandstorm Giga Drain Confuse Ray Stockpile	Attacks: Rock Slide X-scissor Aqua Tail Rock Polish	Attacks: Bullet Punch Double Hit Bug Bite Aerial Ace	Attacks: Earthquake Stone Edge Fire Punch Ice Punch
	Hold Item: Life Orb	Hold Item: Smooth Rock	Hold Item: Smooth Rock	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item
Autumn Only

Pokémon Trainer N	Abomasnow	Vanilluxe	Cloyster	Mamoswine	Froslass	Glaceon
Battle Type Single Battle Items	Level 77	Level 75	Level 75	Level 75	Level 75	Level 75
	Snow Warning	Ice Body	Skill Link	Snow Cloak	Snow Cloak	Snow Cloak
	Attacks: Blizzard Wood Hammer Earthquake Grasswhistle	Attacks: Blizzard Flash Cannon Signal Beam Hail	Attacks: Icicle Spear Hydro Pump Ice Shard Shell Smash	Attacks: Earthquake Ice Shard Blizzard Stone Edge	Attacks: Blizzard Shadow Ball Psychic Hail	Attacks: Blizzard Shadow Ball Signal Beam Attract
	Hold Item: Life Orb	Hold Item: Icy Rock	Hold Item: No Item	Hold Item: No Item	Hold Item: Icy Rock	Hold Item: No Item
Winter Only