Dragapult is now the only pseudo-legendary Pokemon to not have its own unique gimmick.

Gen1 – Dragonite(Has a Mega)
Gen2 – Tyranitar(Has a Mega)
Gen3 – Salamence and Metagross(both have Megas)
Gen4 – Garchomp(Has a Mega)
Gen5 – Hydreigon(Has a Paradox relative in Iron Jugulis)
Gen 6 – Goodra(Has a regional form in Hisui)
Gen 7 – Kommo-o(Has the Kommonium Z crystal)
Gen 9 – Baxcalibur(Has its own Mega)