What does the Pokemon ability overgrow do?

You can't. Each Pokemon gets their ability at birth. There is a 50/50 chance of getting either ability if it has two. Getting the right ability/nature/IVs is tough so good luck

I use a Zigzagoon the higher the lv the better items it will pick up.

u can't

i have never heard of such an ability, so i dont think you can. ___________________________________________________attract~MetalUmbreonthe ability static atracts the electric type... and another...

The ability insomnia prevents the Pokemon(having insomnia) from falling asleep during a battle. U must have fought Pokemon who uses the moves like yawn or sleep powder or hypnosis which make your...