Add the following skills:
- Anti-air Shot
- Arrow Rain
- Rocket Launcher
- Wolf Rush
When he is far away but in the screen, use Wolf Rush to knock it down.
Use Arrow Rain while it is on the ground.
Before he could start moving, use Rocket Launcher to send him up into the air.
Spam Anti-air Shot.
If your Rocket Launcher is level 2 or below,
Use Arrow Rain,
Use Rocket Launcher,
The best way is to Rocket Launcher it while you can, and spam Anti-air Shot.
The rest of the skills are to assist in letting him fall to the ground, so he/she will be vulnerable to Rocket Launcher.