Pokemon/Sonic

Version 1

 * Pikachu as Sonic
 * Piplup as Tails
 * Buizel as Knuckles
 * Chikorita as Sally
 * Eevee as Bunnie
 * Turtwig as Antoine
 * Squirtle as Rotor
 * Gligar as Uncle Chuck
 * Buneary as Amy
 * Bellossom as Cosmo
 * Jigglypuff as Cream
 * Togepi as Cheese
 * Cresselia as Vanilla
 * Sudowoodo as Big
 * Meowth as Shadow
 * Glameow as Rouge
 * Entei as E-123 Omega
 * Celebi as Tikal
 * Pichu as Manic
 * Litwick as Sonia
 * Mewtwo as Dr. Robotnik/Dr. Eggman
 * Magby as Snively
 * Pichu (Pichu Big) as Scratch
 * Pichu (Pichu Little) as Grounder
 * Teddirusa as Coconuts
 * Wooper as Robotnik Jr.
 * Smoochum as Breezie
 * Aipom as Blaze
 * Sparky as Silver
 * Emolga as Marine
 * Ditto as Emerl (Ditto and Emerl both can copy thier opponents powers and abilities)
 * Mini-Dit as Gemerl
 * Ekans as Roller
 * Koffing as Ball Hog
 * Beldum as Decoe
 * Magnemite as Bocoe
 * Mankey as Bokkun
 * Dakrai as Black Doom
 * Pulse as Orbot
 * Minun as Cubot
 * Mightyena as Yacker
 * Krokorok as Vector
 * Bisharp as Espio
 * Scraggy as Charmy
 * Audino as Nicole
 * Geodude as Mighty
 * Pachirisu as Ray
 * Larvitar as Rocket
 * Mudkip as Lucas
 * Bellossom as Cosmo
 * Pikachutwo as Scourge
 * Squirtletwo as Miles Prower
 * Bulbasuartwo as O'Nux
 * Ash as Chris
 * Brock as Danny
 * Misty as Frances
 * May as Helen
 * Dawn as Topaz
 * Dragonite as Dulcy
 * Raichu as Sonic the Werehog
 * Arbok as Sleet
 * Seviper as Dingo
 * Bulbasaur as Sonic Jr.
 * Treecko as Sarah
 * Gible as Timothy
 * Other Pokemon and Humans as Other Characters (from Sonic)

Version 2

 * Ash as Sonic
 * Max as Tails
 * Brock as Knuckles
 * Paul as Shadow
 * May as Rouge
 * Kenny as Omega
 * Dawn as Amy
 * Misty as Cream
 * Iris as Cheese
 * Harley as Big
 * Leaf as Sally
 * Kris as Bunnie
 * Gary Oak as Antoine
 * Drew as Rotor
 * Kelly as Dulcy
 * Trip as Griff
 * Nathaniel as Charmy
 * Dr. Eggman as Himself
 * Scratch as Scratch
 * Grounder as Grounder
 * Coconuts as Coconuts
 * Pikachu as Chris
 * Piplup as Danny
 * Buneary as Helen
 * Aipom as Frances
 * Sandra as Marine
 * James as Jet
 * Jessie as Wave
 * and more

Version 3

 * Pikachu as Sonic
 * Piplup as Tails
 * Buneary as Amy
 * Buizel as Knuckles
 * Glameow as Rouge
 * Meowth as Shadow
 * Jigglypuff as Cream
 * Bellossom as Cosmo
 * Sparky as Silver
 * Aipom as Blaze
 * Pichu as Manic
 * Litwick as Sonia
 * Mewtwo as Dr. Eggman
 * Pichu (Pichu Big) as Scratch
 * Pichu (Pichu Little) as Grounder
 * Teddirusa as Coconuts
 * Magby as Snively
 * Smoochum as Breezie
 * Wooper as Robotnik Jr.
 * Ekans as Decoe
 * Koffing as Bocoe
 * Chimchar as Bokkun
 * Plusle as Orbot
 * Minun as Cubot
 * Ash as Chris
 * Drew as Danny
 * Misty as Helen
 * May as Frances
 * Professor Oak as Chuck Thorndyke
 * Delia Ketchum as Linsey Thorndyke

Version 4

 * Ash as Sonic
 * Max as Tails
 * Brock as Knuckles
 * May as Amy
 * Misty as Sally
 * Gary as Antoine
 * Professor Oak as Uncle Chuck
 * Dawn as Cream
 * Delia as Vanilla
 * James as Shadow
 * Jessie as Rouge
 * Butch as Silver
 * Cassidy as Blaze
 * Ghetsis as Mephiles
 * Pikachu as Chris
 * Piplup as Danny
 * Buizel as Sam Speed
 * Buneary as Helen
 * Jigglypuff as Frances
 * Glameow as Topaz
 * Giovanni as Dr. Eggman

Version 5

 * Ash as Sonic
 * Max as Tails
 * Brock as Knuckles
 * Misty as Amy
 * Dawn as Rouge
 * Paul as Shadow
 * May as Blaze
 * Drew as Silver
 * Casey as Cream
 * James as Dr. Robotnik (AoStH)/Eggman
 * Jessie as Mama Robotnik
 * Giovanni as Dr. Robotnik (SatAM/SU)
 * Pikachu as Chris
 * Piplup as Danny
 * Buneary as Helen
 * Jigglypuff as Frances

Version 6 (Made by AshAndFriends9168)

 * Ash - Sonic
 * Max - Tails
 * Brock - Knuckles
 * Dawn - Amy
 * Giovanni - Dr. Eggman
 * James - Decoe
 * Butch - Bocoe
 * Meowth - Bokkun
 * Iris - Cream
 * Piplup - Cheese
 * Professor Juniper - Vanilla
 * Miki - Rouge
 * Tracey - Big
 * Erika - Tikal
 * Paul - Shadow
 * Gary Oak - Vector
 * Barry - Charmy
 * Steven - Espio
 * Bonnie - Cosmo
 * May - Blaze
 * Drew - Silver
 * Lt. Surge - E-123 Omega
 * Ritchie - Chris
 * Khoury - Danny
 * Casey - Helen
 * Lyra - Frances
 * Delia - Lindsey
 * Professor Elm - Nelson
 * Professor Oak - Chuck
 * Nurse Joy - Ella
 * Butler - Mr. Tanaka
 * Diane - Topaz

Version 7

 * Pikachu as Sonic


 * Vulpix as Tails


 * Hitmonchan as Knuckles


 * Jigglypuff as Amy


 * Buneary as Cream


 * Manaphy as Cheese


 * Umbreon as Shadow


 * Espeon as Blaze


 * Kirlia as Cosmo


 * Dusknoir as Dr. Eggman


 * Ekans as Scratch


 * Koffing as Grounder


 * Mankey as Coconuts


 * Golett as Bocoe


 * Sudowoodo as Decoe


 * Snorlax as Big


 * Banette as Bokkun


 * More coming soon...