>>23371383Well, most recently there was this, but they're larger than 28mm:
http://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Trading_Figure_GameAnd before that, Japan had a collectible figure game with very nice figures, but again, bigger than 28mm. Almost twice that, actually, if the Manectric I own is any indication.
The only 28mm figures (with bases, at least) I can think of were Japanese gashapon prizes made by Bandai (pictured), and they can be pretty expensive second-hand:
http://pkmncollectors.wikia.com/wiki/Full_Color_AdvanceNone of these have the Pokemon to scale, but I'm unsure if you were asking about that.