I've already bought a Lizard Minion Trap and I'd like to know if Lizard Minion Repellant will increase my chances for beating the Lizard to 75% or 50% is a max?

If you have both the spray and the trap in your inventory you get a 75% chance of grabbing whatever item that they're trying to swipe in their random event.

Thank you for the answer. ^^ goes to buy a Lizard Minion Repellant

you actually have closer to 100% chance of getting the item.

Really? I never realized that. I knew it wasn't 100%, because you can still miss the odd one, but I never knew it was over 75%

yeah i thought it was 75% too but someone told me it was closer to 100%.