With perilous jungle and radiant snealser anything that isn't darkness type will take 50 damage during ckeckup. That's honestly alot, plus the aded damge from Iron Valiant, we can Devo them and get the knockout during checkup. Eri also combo's nicely with Devo, as we cand get rid of there Rare Candy's and ultra ball's so that we can Boss deffensless Ralts, Charmanders, Charmeleons and Kirlias. In case they Hero's Cape you can Lost Vacuum, and Rotom is there for when you don't need to attack, but just wait for the poison to sink in and destroy them. Now you may be wondering how you attack decks like Iron Hands, or if you run out of Devo's, well I'm working on that so stay tuned because this deck is actually a concept that I like so I will upgrade it soon.
Hope you like poisoning your opponent!