The dragon resistance is useless. The grinder works for all melee weapons.
As far as fishing out the plessy with frogs. You cannot do it if it knows you are there. My suggestion is after jumping in the well at the base camp, just run to the fishes and put the frog in. Do not move until either the frog goes under to fish it out, or it sees you.
As far as armor, i would get Death stench u or something else with high defence stat.
Hipcheck is elementless so getting high defence will minimize damage taken from it. It sux you aint in 2G, naruga armor gives evade distance up which was the only way i ever avoided the hipcheck of doom. Btw, next time you fight it put up your results, mainly how many times you fainted and why, and how long you survived. Good luck!
Anyway, sorry, but im gonna start some reading so i wont be able to respond as much, but ill try.