What type of bug are you reporting? Teambuilder
What is the bug?
Sinistea can't learn Strength Sap (I tried BSS Reg F) while it is legal in the original game.
Are you able to replicate it? If so, how?
in the teambuilder
What is the bug?
Sinistea can't learn Strength Sap (I tried BSS Reg F) while it is legal in the original game.
Are you able to replicate it? If so, how?
in the teambuilder
? Sinistea 
doesn't learn it in-game at all, Polteageist and Sinistcha learn it by level once evolved.