Well, congrats on the weakness management. Only two 2x weaknesses and no worse ones.
Let's see...does Endeavor + Leftovers tend to work well? Seems to me the healing from Leftovers would weaken Endeavor's effect. You know Lefties won't heal you enough to execute a perfect Endeavor trap and then stay in the game; that's presumably why you have Milk Drink.
One other thing...I notice half your team has Leftovers. That's fine in some cases, but some of your human opponents will insist on an optional rule called the Item Clause, where no two pokémon on your team may hold the same item. Do you have any plans for what to use instead, in the event of an active Item Clause? Shell Bell would probably work fine for Swampert, but you'd still have two Lefties...