This game, as decent as it is, has it's issues, no shop which means you have to grind for potions alone, and on the GBA, Castlevania drop rates are ASSSSSSSSSSSSS. It also doesn't help the card system which this game uses....is cool in concept but the fact that it depends on drops is horrible, I used the cheats for that right away but looks like you don't even need to, you can easily use all the cards with a simple to do glitch, which is not patched even in the Advance Collection (cool lol). Battle Arena felt impossible for me, I wanted to go 100% and ended up grinding up to Level 60 with Lilith (easier said that done) and I had everything except the Arena done, I eventually said screw it and got a cheat for uhh...I think more item drops? It somehow wiped my save and pissed me off. I ended up getting an internet save to just fight Dracula instead, I beat him thanks to how stacked out the inventory was but then it felt hollow so I said, no I'll do this the way I would only with the items I'd have in my inventory, so I did (tho I only ended up using a Mind Up) and finally beat the game legit. So the lesson is, don't force yourself to do something you don't wanna, this especially goes for when 100% equals not fun for me. But I did everything else and I quite enjoyed that, so that's enough for me!

Either way, fun game but the ones after it are much better.
I used the AutoDash hack too cuz yeeeeesh the way Dashing works and your default walking speed are just awful, downright unbearable for a whole game if you ask me. Good thing I'm not playing on a real GBA or the Advance Collection.