Good:
skip poison point chance on roselia -1.49s
skip bounce learn on hawlucha -2.75s
-2 out of battle levels -3.54s
-3 in battle levels -10.26s
-11 exp share texts -5.06s
hawlucha consistency -1s
l43 for sylveon -1.5s
total: -25.6s

Bad:
coumarine rival +2s
simisage +5s
roselia/wormadam +5.5s
gloom/exeggutor +16.5s
ramos +5.5s
extra heal in existing menu +2.5s
aura sphere for r14 absol +2.75s
total: +39.75s

net: +14.15s

Strat:
Doable only with bonus candy

Equip Black Belt on Lucario, swap to front in pre-water menu.
Turn off Exp. Share in this menu or some previous menu (maybe bike menu)

Coumarine Rival: SD (x2 if Fake Out), BR + RT, LS, LS
Simisage: SD + LS
Roselia/Wormadam: SD, RT x2 (15/16 on Roselia)
Gloom/Exeggutor: SD x2, LS, LS x2
Ramos: SD x2, RT, LS, RT

...

In fly menu before Olympia, Rare Candy x3 to L50, follow Rock Smash Candy strats.