Thunder SHG sends out energy across a set range. It is available at the beginning and requires a Lightning Magic stat of 60.
Thunder SHG-II sends out piercing energy across a set range. It can be learned by using Thunder SHG at least 300 times and requires a Lightning Magic stat of 65.
Thunder SHG is a HP Attack used by Ace. Thunder SHG's range can be increased by charging it. With one flash, it becomes Thundara SHG. With two flashes, it becomes Thundaga SHG.
Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).