The below is what you’ll need.

Slowbro @ Life Orb
Ability: Oblivious
EVs: 252 HP / 4 Def / 252 SpA
Modest Nature
- Nasty Plot
- Iron Defense
- Psychic Terrain
- Stored Power

How to use:
1. Set up Iron Defense 3 times
2. Set up Nasty Plot 3 times
3. Use Psychic Terrain or else it won’t OHKO
4.Use Stored Power

Remember, solo NPCs are more useful than online players, ironically enough. The NPCs are competent enough to stay alive and too incompetent to do much damage to Cinderace, so they will not trigger the shield. Online players are the inverse, which is obviously bad for you and triggers the rabbit to reset your stat changes.

Note: Use the “Heal” cheer when low on health. Slack off isn’t worth the moveslot.