Are Wonder Picks getting worse?

Wonder picks are well known to be pre determined and that’s okay to an extent but lately I’m finding I’m getting no good wonder picks and it’s becoming extremely rare to get one that costs 3 with an ex. Is this due to the game making it harder to get ex cards from packs? I almost exclusively got alt yampers and stunfisk since suicune came out. Are they making it harder to get good cards? I do not spend money on this game.