It doesn't have any inherent rules meaning, but some Gates, including some found in this set, have abilities that care either about which other Gates you control or the number of other Gates you control
Cap Raiser: Jacqueline's main ability can normally be used once per round, but her signature asset, "Arbiter of Fates", increases the limit to two times per round instead (the first time she triggers her ability during the round, she can exhaust her signature instead of "spending" one use of it)
However, their overall consistency is lower, making significant tournament success less likely without specific advantages or innovative play
Interestingly, its a Basic Pokemon, rather than a Stage 2, so it can be used immediately rather than needing to be evolved
Phantasmal Flames Themes As players build their decks, the heavy focus in Phantasmal Flames is Fire and Darkness with big HP and damage