Wobbuffet at a very high level would work well because of it's ability "Shadow Tag" which prevents foes from escaping. Latias (Sapphire) and Latios (Ruby) always try to when you battle it. Golbat with the move "Mean Look" and also at a very high level would work just as well. Even though the pokemon Trapinch has the ability "Arena Trap" which is meant to stop pokemon from escaping, it won't work on Latias or Latios. This ability doesn't work on pokemon that are flying type or have the ability "Levitate" and Latias and Latios have this ability.