Liz: STRIFE! is the first "flash" in Act 1. Rather than being an actual Flash, however, it is a Youtube video.

In it, Liz confronts some bullies in a mock Pokémon battle. She first throws a Pokéball at them, which has no effect. Bully #2 then uses punch on her, which is super effective. Bully #1 then throws the Pokéball back at her. Liz then opts to run, and we see her looking in fear as the bullies converge on her against the lockers.