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These ultra boxes seem pretty good
Amirite?
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There is absolutely nothing saying that they need to raise the pokemon level cap if they raise the trainer level cap.
As for the pokemon level cap, they could easily make it scale even worse for the stats after 40 while keeping the steep increase in resource cost. This would mean that only the most hardcores of players would max to the new level cap, or maybe more players would start considering it as something you only do for your favorite pokemon. Or if they don't make the reward-resource cost ratio super bad, they could always add new items that you need to raise pokemon beyond level 40 and gate them somehow so players would be extremely limited either way.