Unfortunately I don't have a replay for this (I uploaded the replay but it's out of time range), but when my friend (who I will not name because if I did this stuff I wouldn't want people to know) started hackmons and had a test battle against me as his first battle, it included some of the silliest things one could imagine, such as:
perish song dive blissey without shadow tag (he thought dive would evade perish song killing her, even though just switching would work better)
dig garchomp that mega evolves with actual garchompite (he's good at OU and knows that dig isn't even good in PU, I can't imagine why he thought it would suddenly be good in hackmons)
deoxys-speed with no guard, spore, and 3 OHKO moves (how many times have you seen that before)
speed boost salamence (not inherently badly designed, but outclassed to the point where you might as well nickname it mismagius)
and
wondereye with basically the moveset of a regular sableye (will-o-wisp, knock off, shadow sneak, recover)