It's not about 'tactics' in this case. It's about playing by the rules, which is usually bullshit, but if you want to win their prizes you gotta do it by their terms. You can't just let your pet monster do everything for you.

[Shigaraki has Opinions about MMOs. More about gachas, but the world hadn't ended because of one yet where he's from. He jerks his chin towards the charmander, and the now flame broiled weedle.]

If he can do it all himself, what good are you? But the critter needs the experience, so you gotta participate somehow. Teamwork, power of friendship, all that idiotic stuff.