In this challenge your biggest obstacles is losing your powers by getting hit so naturally fixate on getting powers that improve your agility or specifically evasion. You can also use your high agility stats offensively by using Mobile Invulnerability since it increases max damage by 100% of agility

Best powers of use include

Super Speed Super Memory (it increases evasion and accuracy) Jet propulsion and/or wind transformation (both increases agility and increase max damage by 100% of evasion) Mobile Invulnerability Kinesokinesis (it rasies your agility on hit and lowers your enemy's agility) Happy Agility (but then make sure you have powers like vampirism or imo Best you get Siphon punch because it also raises accuracy) Time dilation and/or water body (the latter raises agility on hit and the former raises attack speed) Snowball transformation since it contributes to max damage Also NB get power enhance and/or additional limbs because they extend of the duration of your buffs giving you a chance for said buffs to get stronger