I'm replaying Diamond for the story and put a lot of thought into my team. I decided I want to be the OT of an Elekid which must be in an Ultra Ball (I know I'm being stubborn but the heart wants what it wants...)
Anyway. I've been doing research and found out this will only be possible if I get the National dex to unlock dual-slot mode. I'm okay with this as long as it's not too late in the game. I hope this isn't just a pipe dream.
...so what's the minimum amount of badges I'll need for the National Dex?