Sure, there have been some non-ex decks that perform pretty well, like the Lucario fighting type list from a few seasons back, but usually they're a tier below the decks led by the top ex cards, and people like me only play them to be different (or because we haven't found the right exs yet)
Yes, you can overload from exile
The goal is to maximize the power of Asmo, shown above
This means it can defeat Arceus ex before the Pokemon can even set up
I even ruled out cards like Horn of Greed that provide means to draw many cards but don't do it on their own
While the anime and video games follow the exploits of Goku, Gohan, and their friends, the TCG allows players to use any of the characters available