No Huge Power shit, and try not to go full mega beedrill

Mega Dusknoir
Ability: Reaper (Ghost type moves used by this Pokemon restore 1/4 of damage dealt to the opponent)
If this is too overpowered, then Iron Fist I guess (shadow tag fits but he'd be so banned).
HP: 45
Attack: 100 > 150
Defense: 135 > 160
SpAtk: 65
SpDef: 135 > 160
Speed: 45

Now learns Drain Punch

What tier is he now? I just want my bro to be good...