Eh, depends on the Pokémon. My friends and I have used that training method before and I have a few that were willing to take one for the team. Not that they just stood there and took it, mind you, but they knew who had to win in the end and pulled their punches.
Whatever works though! A second pair of eyes never hurts with this sort of thing.
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Whatever works though! A second pair of eyes never hurts with this sort of thing.