in order to get heat wave first get a charlizard by going to the move tutor in Firered/ Leafgreen. But in Emerald Charkoal learns it at lvl 48.
In the heat gym
The TM thunder wave no longer is a TM.
You have to get it in a trade.
No you cannot catch Entei in Pokemon Emerald.
sorry, you can't get riolu in Pokemon emerald version.
Red version was not made to migrate with emerald.
There is no space suit in the Emerald Version.
Emerald can trade with Leaf Green but not Pokemon Red
You can buy emerald version in Game Stop near Madison
hearthome does not exist in emerald
You cannot reach kanto in emerald version only in silver, gold or crystal.
You cannot get Regigigas on Emerald version.
no. a heat wave is weather, a heat stroke is a health condition.
In the heat gym
The emerald doesn't exist in firered.
Snowpoint city is not in emerald version.
You have to trade from Firered or Leafgreen version.