FINALLY got around to beating e18. took me long enough lol, seeing as i first played reborn early 2019. here's the stats and team as of beating Hardy. i plan to complete the pokedex eventually
it's a glitch. it would be best to revert to a past save and run away instead of handing the time diamond over, which will still add towards the bad ending
torchic, chimchar, scorbunny, and grookey aren't available unless you picked them as a starter. the tepig encounter seems to be glitched, but that might've been fixed. mudkip is available in the sheridan wetlands
drifloon is a 1% encounter on wispy path 24/7, but a 2% encounter in both goldenleaf town and forgotten path at night. here's the full v13 encounter list if you have trouble finding a certain mon in the future