You need 99 magic, defence and HP in order to do Polypore stakes. The issue with polypore stakes, or and weapon stake for that matter is:
The scammer will use "stalls". Stalls are items that are used in a specific way in o order to secure last hit, aka PID.
The scammer will ask for an inventory check meaning that you show your inventory so neither can bring stalls. You send a trade request, then a challenge request.
He will accept trade and you will both show items. Then he will accept challenge so the trade screen will go directly to the challenge screen to assure that none of you bring in items that can give an advantage.
The thing is that the scammer will send you a trade request on 1 account and a challenge request with another account with a similar name.
So when you show items in trade window to make sure you don't have any other items you will end up accepting the challenge with his other account. That account will have stalls and better items such as a seismic wand + shield perhaps instead of a polypore staff.
RS3 is really broken and items are unbalanced. The scammers are up to date regarding the items that are best at the time so anti scamming is really risky.