1. Don't even use Ground Moves to weaken Rotom. He has an ability that allows immunity to it.
2. Normal and Fighting Type moves do not work either as he is a Ghost Type.
3. Weaken it as much as possible, since Rotom has a capture rate of 45, which is pretty low.
4. SAVE BEFORE YOU FIGHT/ENCOUNTER LEGENDARIES OR ONE-TIME OPPORTUNITY POKEMON.
45 is low? I always thought of Rotom as an easy catch(although you can't use False Swipe...) I used a dusk ball at night to catch it..
gonna go for Battle Factory again... (although I'm really getting tired of it...) should I go lv 50 or open lv?