Attack Name	Battle Type	Contest Type
Screech
Power Points	Base Power	Accuracy
40	0	85
Battle Effect: Emits a screech to sharply reduce the foe's DEFENSE.
Secondary Effect: Lowers opponent's DEFENSE two stages.		Effect Rate: -- %
TM #	Appeal Points	Jam Points
None
Contest Effect: Badly startles those that have made appeals.
BrightPowder	King's Rock	Physical Contact
Yes	No	No
Battle Palace Style	Battle Arena	Pokémon Hit in Battle
Defense	+0	Selected target
Picture Example of Screech

Pokémon That Learn Screech By Level Up in Ruby/Sapphire/Emerald/Colosseum/XD:

No.	Pic	Name	Type 1	Type 2
#023		Ekans
#024		Arbok
#042		Golbat
#052		Meowth
#053		Persian
#054		Psyduck
#055		Golduck
#056		Mankey
#057		Primeape
#072		Tentacool
#073		Tentacruel
#081		Magnemite
#082		Magneton
#088		Grimer
#089		Muk
#095		Onix
#100		Voltorb
#101		Electrode
#101		Electrode
#108		Lickitung
#125		Electabuzz
#158		Totodile
#159		Croconaw
#160		Feraligatr
#169		Crobat
#190		Aipom
#193		Yanma
#197		Umbreon
#206		Dunsparce
#207		Gligar
#208		Steelix
#215		Sneasel
#239		Elekid
#246		Larvitar
#247		Pupitar
#247		Pupitar
#248		Tyranitar
#248		Tyranitar
#252		Treecko
#253		Grovyle
#254		Sceptile
#291		Ninjask
#293		Whismur
#294		Loudred
#295		Exploud
#318		Carvanha
#319		Sharpedo
#329		Vibrava
#330		Flygon
#336		Seviper
#352		Kecleon
#353		Shuppet
#354		Banette
#354		Banette
#367		Huntail

Pokémon That Learn Screech By Level Up in Fire Red/Leaf Green:

No.	Pic	Name	Type 1	Type 2
#023		Ekans
#024		Arbok
#042		Golbat
#052		Meowth
#053		Persian
#054		Psyduck
#055		Golduck
#056		Mankey
#057		Primeape
#072		Tentacool
#073		Tentacruel
#081		Magnemite
#082		Magneton
#088		Grimer
#089		Muk
#095		Onix
#100		Voltorb
#101		Electrode
#101		Electrode
#108		Lickitung
#125		Electabuzz
#158		Totodile
#159		Croconaw
#160		Feraligatr
#169		Crobat
#190		Aipom
#193		Yanma
#197		Umbreon
#206		Dunsparce
#207		Gligar
#208		Steelix
#215		Sneasel
#239		Elekid
#246		Larvitar
#247		Pupitar
#247		Pupitar
#248		Tyranitar
#248		Tyranitar
#252		Treecko
#253		Grovyle
#254		Sceptile
#291		Ninjask
#293		Whismur
#294		Loudred
#295		Exploud
#318		Carvanha
#319		Sharpedo
#329		Vibrava
#330		Flygon
#336		Seviper
#352		Kecleon
#353		Shuppet
#354		Banette
#354		Banette
#367		Huntail

Pokémon That Learn Screech By Breeding:

No.	Pic	Name	Type 1	Type 2
#019		Rattata
#020		Raticate
#046		Paras
#047		Parasect
#048		Venonat
#049		Venomoth
#050		Diglett
#051		Dugtrio
#090		Shellder
#091		Cloyster
#104		Cubone
#105		Marowak
#109		Koffing
#110		Weezing
#126		Magmar
#170		Chinchou
#171		Lanturn
#179		Mareep
#180		Flaaffy
#181		Ampharos
#190		Aipom
#200		Misdreavus
#222		Corsola
#223		Remoraid
#224		Octillery
#240		Magby

Pokémon That Learn Screech By Purifying or A Special Way: