>>23271793>>232717961. Kill all non-boss Pokemon. They seem infinite, but will always eventually stop spawning around 100 kills or so
2. Damage the boss enough so that it only has a little health left (enough so that it can be killed in 3 or 4 additional hits)
3. Switch to a Gutsy pokemon with Endeavor
4. While the boss is doing its 'charge up' animation (bouncing up and down with smoke coming out of its head right before it becomes unhittable) keep hitting it with Endeavor until it wobbles. If it gets to the invulnerable stage before wobbling, wait until its next charge up animation and do it again
5. Kill it quickly before it stops wobbling