get gible from secret cave
try your hardest to get a heracross
staraptor, clefable, luxray, and/or magnezone are pretty safe picks for your team
if you want speed, consider using crobat, floatzel, and jolteon
bibarel and staravia are good hm slaves
you get an eevee in hearthome from the girl whom makes pcs
drifblim or whatever it is only shows up on fridays
you have access to rotom as soon as you get cut but its level 20 and can't get its form changed
theres an optional route south of whatever the town is that dawn and the professor are with level 30 ish trainers as soon as uou get surf, good for grinding
grow LOTS of leppa berries
and have fun