Only took me a couple of tries to get this clear in! Glossom was surprisingly easier than Tikilen for me, but I think difficulty of fights depends on the state of your account. I don’t really have that many tips to give, but just make sure you watch your SP and keep some dark damage alive for when Glossom activates Warlord’s Stance.
4:24 First Add
15:51 Second Add
25:35 Warlord’s Stance (Weakness Lock)