>>44390475I use Latios to powerlevel my pokemon in the 3rd gen. I cloned him and gave him Memento so the only option he has is to die. All I have to do at that point is just use 3 X-attacks or stat-boosting moves on my end and I'm set until the next day. Easily get pokemon to level 100 in minutes using multiple caves.
Great HM slave too, I always keep it in my party.
Battling? Why would you use a Latios in a battle