All characters: Ken Ryu (Al) Harry Natsume (Sabrina) Kyou (Koga) Rocket Underling (Rocket Grunt, looks like a mix between R/G/B/Y and pre-BW anime facemask) Lance (Proton) Rocket Underlings (Rocket Grunts, HG/SS) with Delicious Tails (Slowpoke's Tails) Apollo (Archer) What appears to be a Sakaki (Giovanni) poster (?) I suppose it's an Isshu (Unovan) Underling, ex-Rocket member Dr. Fuji Armoured Myutsu (Mewtwo), Sakaki's from anime Yamato (Cassidy) Metamon (Ditto), Mondo's Mondo Musashi (Jessie) Miyamoto Utsubot (Victreebel), Kojirou's Kosaburou (Butch) Sonans (Wobbuffet), Musashi's Rocket Nyarth (Rocket Meowth), in anime an independent member, in games he was Kojirou's and Musashi's Manene (Mime Jr.), Kojirou's Dogars (Koffing), Kojirou's Arbok, Musashi's Dr. Namba Matis (Lt. Surge) Rarecoil (Magneton), Matis' (he wore them like shown on picture) Marumines (Electrodes), Matis' (he wore them like shown on picture) Biriridama (Voltorb) (?), Matis' (he wore them like shown on picture) Katsura (Blaine) Yungerer (Kadabra), Natsume's Lambda (Petrel) Athena (Ariana) Male/Female Rocket Underlings (Rocket Grunts, HG/SS) Delibird, Solicitor's Old Lady (Rocket Scout's), who is not shown on this picture Sabonea (Cacnea), Kojirou's Gingie (Wendy) Utsubot (Victreebel), Kojirou's Kojirou (James) Muskippa (Carnivine), Kojirou's Dr. Shiranui (Prof. Sebastian) Buson (Attila) Vicious/Bishasu (Iron Marauder/Iron-Masked Marauder) Oka (Orm/Oca) Chakra (Carr/Jagura) Saque (Sird/Storc) Silver, as he appears in FR/LG chapters Kamen no Otoko (Mask of Ice, in this form I think known as Masked Man) Siam (Chermaine, Shum, Sham) Kurtz (Keane, Cart, Carl) Red, R/G/B chapters disguise Kotone (Lyra), HG/SS disguise Gold/Hibki (Ethan), HG/SS disguise Wataru (Lance), HG/SS disguise (he also did this in anime) Bashou (Hun) Tatsumi (Tyson) Domino
Oh boy that's sure a lot, but still few are missing! A lot is not tagged, I'm not really sure about tagging policy here, I would even show which one is which if I knew how to. Some are very well hidden, but it's easy to spot them if you take a closer look.
Updated
Kojirou/James (anime)Wataru/Lance (anime)Mondo (radio drama)Grunt (RGBY)Red (Pokémon Special)Lyra and Ethan (HGSS)Musashi/Jessie (anime)Yamato/Cassidy (anime)Kosaburou/Butch (anime)Kyou/Koga (Pokémon Special)Team Rocket Trio (Pokémon Special)
Ken
Ryou (Al/Ryu)
HarrySilver (Pokémon Special)
This outfit appears in the FRLG chapter.Saki/Sird (Pokémon Special)Armored Mewtwo (movie 1)Gingie/Wendy (anime - episode 231)Lance/Proton (HGSS)Athena/Ariana (HGSS)Possibly a Sakaki/Giovanni poster (HGSS)Dr. Namba (anime)Matis/Lt. Surge (Pokémon Special)Natsume/Sabrina (Pokémon Special)Lambda/Petrel (HGSS)Male and female Grunts (HGSS)Apollo/Archer (HGSS)Delibird from the Rocket Scout, an old lady not shown in the picture (anime - episode 231)Fuji (movie 1)Katsura/Blaine (Pokémon Special)Shiranui/Sebastian (anime)Buson/Attila (anime - Legend of Thunder)Bashou/Hun (anime - Legend of Thunder)Vicious/Iron-Masked Marauder (movie 4)Ouka/Orm and Chakra/Carr (Pokémon Special)Kamen no Otoko/Mask of Ice (Pokémon Special)Siam/Sham (Pokémon Special)Kurtz/Carl (Pokémon Special)Tatsumi/Tyson (anime)Domino (anime - Mewtwo Returns)Miyamoto (radio drama)Male and female Grunts holding Slowpoke tails (HGSS)Possibly the ex-Rocket member living in Icirrus City in Unova (BW)