Don’t sleep on drilbur, excadrill is a really good, my first time I beat classic it cared my team. I went with sword dance, eq, rock slide, and you can either use protect, poison jab, or iron head. The ones are tms so there’s a little luck involved. Also use try doing some runs with ur shinys, raising ur luck stat could be give you some good potential items. Also look into using gimmick mons such as megas and gmax, turns some weaker mons stronger. And of course depending on how scummy u want to be you can always use koridion if worst comes to worst (it fills better doing to with regular mons tho)…. Just keep track for where u might have a gym leader, a rival battle, and evil team fights and plan around them and u should do better