This time, YES, the original ones X3 here you have the reference I used -> [link]
Their japanese names as you know are Tsutaja (ツタージャ), Pokabu (ポカブ) and Mijumaru (ミジュマル)
Please, don't ask why the shell is not in the belly of Mijumaru. . . I prefer to think it's an accessory of the Pokémon, not something inlayed in the belly.
Hope you like them! ^3^~<3
See this picture too please~! ->
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Time Spent: 6-7 Hours Pokémon belongs to Game Freak Art belongs to me, =Cachomon
Funny, in the new season of Pokemon (Best Wishes) Mijumaru actually takes off the shell and use it as a weapon. And in here, Mijumaru has the shell off. You made a futuristic guess and got it right! (I know, random comment )
Tsu: Ride little piggy, ride!
Pok: *Happily runs*