You can’t pick who you vs in a ladder match. If you’d like to play your friend in a 1v1 then you have to do a custom game to play with them.
As far as the beetle is concerned I’ve got no clue if there’s an up to date video on how to cheese with them. Cheese is all they’re good for, can use their cloaking and stealth to attack random mexes and stuff that would generally be otherwise protected