You have to defeat the eight gym leader.
HM 07 in emerald is waterfall
You can obtain it from three island when you go to the hotspring a guy in a corner will give it to you
You must obtain Deoxys from Birth Island in Emerald.
TM02 (Dragon Claw) is found very deep inside Meteor Falls on route 114/115. You can get it if you know the HM07 Waterfall.
You cannot obtain it in Emerald, you must trade from LG or FR.
No. You can not obtain exeggcute in emerald. The only way is to trade from FR/LG.
You can't catch or obtain other trainers Pokemon in emerald.
you cant
you get it at cave of origin but you have to beat the gym leader of sootopolis city to use it on the waterfall to ever grande city
You can obtain any Pokémon you have captured on the Emerald cart, but you need to go to the pal park to release and re-capture them.
Hm07 is WATERFALL u find it in the cave on four island i think
The only way to obtain Aerodactyl in Ruby, Sapphire, or Emerald is to trade it from another game.