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Its weird to think the only reason an existing Grass Pokemon isn't part of this shill club is simply because TCPI doesn't want to market one. People liked Snivy but TCPI was all in on Zoroark, Bulbasaur has enduring popularity but his spot next to Red was snatched up by Shillzard.
Rowlet was drop-dead mega popular organically, but TCPI had already planned on shilling Incinreroar from day 1 so the owl hung back while they put Incineroar in Smash.
The thing about shillmons is that their popularity stems from overexposure. Lucario is popular because he got a movie, Smash Bros, and players got a free one. TCPI could release Project Decidueye and give it a new form with not-Protean and amazing stats if they wanted but they don't for whatever reason.