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Throw all 30 into its speed stat, srsly its fucking awful.
Hell take an extra 30 out of Sp.A and throw it into speed so ariados hits an even 100 base speed, and maybe take 10 off defense for 100 attack.
Replace Sniper with either Intimidate, compound eyes, adaptibility, or tinted lens.
Possible sets:
Sticky web suicide lead or double hazards stacker against tanks with toxic spikes + web
Potential late game clean up since it does get 2 priority options, swords dance, and with the proper speed might be able to actually fucking do something, even if its only RU at best.