When could be taken to mean they get +4 when they challenge, and it doesnt go away
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Yes, that does mean this makes it easy to turn this into a solid 4/4 beater that can also block, but four mana to get there is a tall ask given the current speed of the format
For a long time, it wasnt particularly good because it was very slow and restrictive about putting counters on things
The main downside of both Gardevoir EX and our regular Gardevoir is that there are 2 Stage Pokmon: youll need to evolve them up from Raltz and Kirlia, making it so that you wont even see a Gardevoir on the field until turn 3 (unless you use some sneaky Rare Candy)
While this can provide you with a significant source of additional value, Jin-Gitaxias can be a major headache for your opponents