I'm only level six; so far I've encountered the following types of daily challenges:
* put some number of evolution cards in play
* knock out some number of opponent cards
* do some amount of total damage
...and maybe a few others I'm forgetting. For challenges that require versus matches, these are very attainable using Grass (Leaf Charge), Fire (Relentless Flame, Blazing Volcano), Water (Torrential Cannon, Imperial Command, Hydro Fury), Lightning (Storm Caller) and Dragon (Mach Strike).
It's somewhat more frustrating for Psychic, Fighting, Metal, Fairy and Dark challenges. Especially metal. I had maybe 6 straight losses with Steel Sun where I was done before I could even get Solgaleo evolved and charged.
So...are there any theme decks that are marginally useful for completing these types of challenges?
If not, guess I'll have to build a couple of cheesy custom decks that aren't designed to win, but to do some amount of damage using a specific Pokemon type.