Actually I have 2 Question
1) If a Leafeon holding a Coba berry is hit with Brave bird (x2) can it OHKO ?
2) If a Parasect holding a Coba berry is hit with Brave bird (x4) can it OHKO ?
It is in the realm of possibilities. Ultimately, the deciding factor is who is the attacking Pokemon and how many boosts from moves or items did it get. I know this for a fact as just five minutes ago, my Tyranitar with chople berry was killed in one high jump kick from Mega Medicham when I was doing a mock battle