Waterfall glitch in forloun drake (Lavander dungeon room 4)

[Yash2006]

When using waterfall in forloun drake I have greninja and mimikyu having both water type move and fairy I tried to use waterfall there and it shows message mimikyu is guarding all but the option to climb waterfall was not coming and when I tried to change greninja hold item it is not working after I encountered a poke to fight then the message appeared to climb waterfall but it was not usable as I encountered the fight I tried it again but still it is like that