Legendary Arena Entei's Challenge Very Hard - Red Blue Skyla Flinch Strat (5-17 October)
My Skyla/Swanna here does not have Troublemaker 1 which dramatically increases the chance to inflict flinch so it can be very RNG without it. But if you have decent tank and DPS like shown here, it's very possible without it. Troublemaker 1 is best acquired is best acquired from a 3★ Crunchy Lucky Cookie. Gridded Blue would likely make it even easier but I this footage proves it's still easy without it
Ash/Charizard 20/20 4/5 https://pokemon-masters-stuff.github.io/?e=0&grid=00,01,02,03,04,05,06,09,11,12,14,15,16,17,31,32,34,35,36&o=750&p=Charizard
Skyla/Swanna 0/20 3/5 https://pokemon-masters-stuff.github.io/?e=0&grid=00,01,02,03,04,05,06,08,11,14,16,19,20,21,23,24,38,40&o=750&p=Swanna
Blue/Blastoise 0/20 1/5 ungridded(0)
Note: Use the playback speed if you want to watch it much faster