Any suggestions as to what I should use Jewels on? I kind of just used them to get more lives, but I wonder if that's the best idea.
My recommendation is save them up and spend them on coins, since hearts always regenerate but you only get coins after completing a stage - the Meowth stage I mentioned above gives you lots of coins, but it's only once per day, same as the check in coin bonus, whereas you could get 40 hearts a day assuming you play every 2.5 hours.
Base conversion of gems values each heart at 600 coins. With Great Balls costing 2500 coins, I'd almost always rather play again (up to 4 times) instead. Never needed powerups yet but am only at level 98, maybe that'll change. I opted for the 38 hearts and was able to jump way ahead quickly.
I agree with these posts. Jewels are the most valuable currency you have, in general this is how I manage my resources in the game:
-Use hearts to play whatever I feel like playing at the time, but don't buy any.
-Never buy a Great Ball. Coins are so much more valuable than hearts, and you're essentially paying 2500 Coins to not wait 30 minutes for another try. Just use another free heart, the RNG will sometimes screw you even on high % catchability anyway.
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Never ever spend a jewel to prolong a failed stage. That jewel is worth at minimum 5 hearts, so you're better off just taking the loss and trying again, even if that means waiting on hearts to recharge.
-I've been hoarding my coins for the harder stages. I ended up using one on Torchic for extra moves just because 3 seemed ridiculous, but I managed to beat the other 3 move stage in one move (go figure.)
I'll probably hoard my Jewels until I have 12 and then buy Coins with them, since hearts regen for free and once you've bought hearts you're losing free hearts because the clock stops ticking when you're at 5+.
I'm not sure I understand the megas.
The first two I've got clear rocks around the solution pieces. How does that help me?
They clear a bunch of tiles at once, which not only clears disruption blocks, but leads to a cascade of new tiles, giving you a better chance of chaining compared to just 1-2 matches at a time.
EDIT: I managed to beat Mega Lopunny on my first try with 1 turn remaining. My team was Mega Audino (Lv5), Riolu (Lv2), Absol (Lv3), and Eevee (Lv4)