User blog comment:Throwitintome/Potential Ideas/@comment-43568480-20200208154916

Eh, I'm not on board with Phineas And Ferb VS Dipper And Mabel. I get the whole summer connection, but Dipper and Mabel get crushed. Dipper's memory erasure gun might work, since P&F were affected by Doof's amnesia-inator, but that requires Dip to get close. I guess he could scale P&F's contraptions with the magnet gun or with help from Mabel and her grappling hook, but Phineas can just knock it out of his hands from a distance with his ball controlling/launching gadget, which is one of the few gadgets that he still has access to. Also, P&F's luck will just make everything work out for them, unless there is an equally unnatural force of bad luck.