Anime move errors

In the Pokémon anime, there will often come up a Pokémon that knows a move it cannot learn legally in any of the games. It's unknown whether these are actual mistakes or a writing policy of not having to stick to the games too closely.

List of anime Pokémon with moves they can't learn in the games

#	Icon	Name	Move	Episode
012	File:012MS.gif	Ash's Butterfree	Counter	EP003
127	File:127MS.gif	Samurai's Pinsir	Tackle	EP004
110	File:110MS.gif	James's Weezing	Counter	EP006
020	File:020MS.gif	Ash's Raticate	Hi Jump Kick	EP015
001	File:001MS.gif	Ash's Bulbasaur	Whirlwind	EP032
116	File:116MS.gif	Misty's Horsea	Sludge	EP040
001	File:001MS.gif	Ash's Bulbasaur	Tickle	EP050
037	File:037MS.gif	Brock's Vulpix	Agility	EP072
055	File:055MS.gif	Misty's Golduck	Barrier	EP091
055	File:055MS.gif	Misty's Golduck	Psywave	EP091
006	File:006MS.gif	Ash's Charizard	Tackle	EP108
001	File:001MS.gif	Ash's Bulbasaur	Dig	EP225
246	File:246MS.gif	Ash's Larvitar	Harden	EP258
299	File:299MS.gif	Roxanne's Nosepass	Hyper Beam	AG016
372	File:372MS.gif	Michelle's Shelgon	Skull Bash	AG043
187	File:187MS.gif	James's Hoppip	Fly	AG084
397	File:397MS.gif	Ash's Staravia	Gust	DP002
269	File:269MS.gif	Jessie's Dustox	Stun Spore	DP008
425		Marnie's Drifloon	Fly	DP028
436		Saturn's Bronzor	Teleport	DP060
447		Riolu	Aura Sphere	DP071
202		Jesse's Wobbuffet	Bide	Unknown