all you have to do is find a magickarp and lvl him up to 30 without evolving it. Next u must get a redscale which is hard to find. Use it on ur magikcarp. Then you go to the PC and open it put in all ur Pokemon except the lvl 30 magikcarp. Run over to the 1st Pokemon gym and go inside, it doesnt matter where you are inside but just go in. Now use a water stone on magickarp and he will evolve into a redgarydos with over 200 hp at lvl 30 and he will have a move called dragon wrath which does 160 damage and has a high chance to burn the foe.
I did this and my redgarydos is my strongest Pokemon i ever had. I was able to kill a lugia in 1 him.
I hope this secret cheat works for you because i was at GameStop and there was a Pokemon event there and this guy told me what to do to get redgarydose so i did it and it was so powerfull when i lvled it up.
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On Diamond and pearl you don't really see many fire Pokemon or electric types. But really the rarest ones are legendarys. Also Garydos is a good Pokemon hard to get without super rod
You cannot "trade" pokemon between Pokemon FireRed and Pokemon Pearl. Instead, pokemon from Pokemon FireRed Version can be transferred to Pokemon Pearl via Pal Park.
Don't think it does evolve. however it would be cool if it did! I don't use my red garydos in my party anymore as it is just as useless as a normal blue garydos.
you can't catch a ditto on Pokemon pearl or dimond but you can migrate from fire red or emerald
You cannot get the TM Fissure in Pokemon Pearl. Fissure hasn't been a TM move since Pokemon Red and Blue.