Though if its Mythicals instead of legendaries, then Hoopa, who stars in the upcoming Pokmon Legends Z-A Mega Dimension DLC
Light Pokemon usually have Bench support moves, healing Abilities, or Attacks that offer utility to both players in a match
and I know you can do it with newly-entered creatures, but then you're still missing out on blockers
II Heavenward Howl When you next cast a creature spell this turn, that creature enters with an additional +1/+1 counter on it
Nekroz of Trishula is the ritual version of Trishula, Dragon of the Ice Barrier (you know, that monster so good its still limited to 1 copy per deck to this day?) When this card is ritual summoned you can banish 3 of your opponents cards, one each from their hand, field, and graveyard