What is the great achievement?

Getting the Ruby and Sapphire in Celio's Machine.

Okay what you have to do is after you give Celio the Ruby go find the Saphire it is at the Dotted Hole use scratch on the hole and go in there you will find a hole drop in it then read the stone I know it is in braille but it is easy count the blocks for (two,up;four,down;four,left;five,right) this is not the pattern count the word's letters then count the blocks. When you find the Sapphire a man will come and steal the sapphire from you he will give you the second password the first password I believe is goldeen. After you get the two passwords go to the meadows on Five Island there you have to beat the goons in the meaddow then move on to the building which is called the warehouse when you go in there is arrows on the floor I don't know the sequence but you have to through the arrows after you beat I think it's three goons go onto the fourth one and once you beat her she will switch directions on one of the arrows so that you can rest before you go against the scientist who stole the sapphire. He is pretty tough so go heal your Pokemon then kick his butt. Have fun.
-Poni1510-

Complete Kanto's Pokedex and you get a certificate.

To enter Cerulean Cave? You have to help Celio fix the network machine.