Actually, it's not as bad as everyone's making it out to be - In terms of the proportion of R-18 work to SFW work, Gardevoir is only the 9th most lewded pokemon on Pixiv (as of May 2022 at least, I couldn't find an infographic more up to date than that). Yes, Gardevoir is way in the lead of any other pokemon in terms of volume of porn, but that's more due to Gardevoir's popularity in general - the 3rd most drawn pokemon on Pixiv overall, behind only Pikachu and Eevee.
(I also suspect that Gardevoir's ranking - again, in ratio of lewds, not volume - would drop further if you were somehow able to include other art sites like Deviantart and especially Furaffinity in the data - not to say that Gardevoir doesn't get plenty of lewds on Furaffinity, but the competition there would be a lot stiffer!)
All in all, I don't think GardIRyS would actually get lewded any more than regular IRyS already gets lewded as-is.
