I caught up on my second save file, obtaining Deoxys-Attack (increasing total to 422), and doing all the Sevii stuff and breeding required to get the other 17 Pokémon as well as the Squirtle line before attempting Suicune, which I captured on the second successful trapping right at the end.

Now, on the third save file, I’ve already beaten the elite four and all I need to do now is unlock the National Pokédex, complete the Ruby and Sapphire sidequests before I can capture the final Pokémon in a Poké Ball: Raikou!