We don't need to in terms of competition. But if you want to build a team around fast trainers you'll have to in my opinion. You won't be able to power train all of them if you plan on acquiring 3-4 per sesson. The rest packs just aren't enough. You need one off season where you don't need to power train your FTs to farm rest packs. Ideally, this should've been done the very first season. But it is what it is.
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