At least easy for me.
Ok so
1. Start a battle
2. Apply status condition to opposing poke
3. Before the last line of text is complete ("soso fell asleep") press on items to open item menu.
Result: game will freeze consistly, about 20% of time it will unfreeze after 30,, mostly game will hard lock.
Notes.
If I wait for the text to finish it is always fine.
Using a Moto g5
This game is excellent cheers for making