But rotation should happen in August like every other rotation and this set releases in June so there would be a time where both are playable. And when Geninja Zoroark does rotate, we do have a card similar to it, which is Darkrai from DAA.
Kecleon actually may have a practical use as tech in Rapid Strike Builds of Welder. Welder + Rapid Strike energy is a turn one attack and becoming fire type means that it beats Deci so it helps tech against that deck.
I may just be crazy, but I think that Slurpuff could be good for control. With Will/ glimwood to control flips then always getting hammers and other disruption back, plus Klara to retrieve twins, I think that Slurpuff Control could be something. Not top tier, but certainly something