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Marshtomp and Swampert being Dorooda and Clayboss (it's a ku, not a gu) has me think they're more or less the same with the swampy theme, just that they weren't given their proper typing yet.
Also minor, but worth noting:
>Mightyena's ability was Sturdy, not Intimidate.
>Zigzagoon had no Ability.
>Linoone's ability was Intimidate, not Pickup.
Also some of these base stats are even worse than in the final game. Imagine Johto 0.5:
>Mightyena
>HP: 55
>Atk: 70
>Def: 55
>SpA: 50
>SpD: 50
>Spe: 70
>BST: 350