No offense, just asking a question.

Potential new evo? Or maybe just promoting Pokémon 151?

Probably because he's kinda been overshadowed. When I think of Gen 1 'Mons, I forget about Oddish. Or just because everybody loves Oddish. They did the same thing with Lechonk on April Fools day, but that makes more sense. Im just happy to see the little blue guy get the love he's desperately needed.