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Its presence here seems to be due entirely to the Pokmons popularity, in a set with little else to attract collectors whore only familiar with the first couple generations
An Escape Rope to avoid ability lock situations, Counter Catcher may be preferred but in some metas having extra switching cards is always a smart and fair move, for example in the last few months the Salvas Stoutland control is going strong, the Doggo traps an active support pokemon with his Baby Doll Eyes attack and won't let you retreat, plus Stoutland has the ability to keep opponents out from playing supporters, so cards like Tate and Liza and Bird Keeper will be of no use
If a monster(s) you control is destroyed by battle or card effect, while this card is in your GY: You can Special Summon this card, then if you have a monster that mentions "Dark Fusion" in your GY, you can destroy 1 card on the field
This Dialga continues to roar upward in price, as the copies in near-mint condition can command values around $300