And to complement that, [Heart]Gold Pokédex: Volcanoes erupt when it barks. Unable to contain its sheer power, it races headlong around the land.
So there you have, an endless cycle.
Well, it would depend. Barking =/= Roaring, so...
Uwaahh! Groudon is raging!!DooooonDooooonVolcanoUwaahh!! Groudon has awakened!!The volcano is erupting!!Oh! Entei was born from the erupting volcano!Roar! Roar!Now, the volcano over there is erupting!!Ah! Another Entei was born from the volcano!Roar! Roar!W-what's with this guy....