No idea what you might use over Leafeon,
maybe a Machop since everyone uses one maybe something no one really cares about, like a Pachirisu, or a Combee, or whatever....
UPDATE: Beat Roark and Mars again, entered Eterna Forest. Caught 2 Misdreavus there, this took me all the 30 Pokeballs i had. One is neutral, the other one has a -Speed nature, so i've to go with the neutral. Taught Misdreavus Hidden Power, but didn't figure out the type yet, only thing i know is that it hits Bug neutral.
Ramao / Machop m Lv. 25

@ /
Naive Nature / No Guard
- Revenge
- Rock Tomb
- Focus Energy
- Karate Chop
Rock and Fighting are perfect to hit stuff, few things resist that combination
Zombies! / Misdreavus m Lv. 13

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Hardy Nature / Levitate
- Growl
- Psywave
- Hidden Power Poison/Bug/Ghost/Steel/Water/Electric/Psychic/Ice/Dragon/Dark
- Karate Chop
My boring standard nickname for ghosts, a quote from one of the channelers in Pokemon Tower