As many of CAP veterans know, Voodoom has aged the worst out of all the CAPmons, as the three generations after its release have nothing for it. The massive power creep of Gen 5, the introduction of Fairy-types in Gen 6, and the increased usage of Fairy- and Fighting-type moves have done Voodoom no favors, not to mention the speed creep over every generation.

Its concept was to Baton Pass Nasty Plot boosts back and forth between it and Togekiss. While it's predominately a Special Attacker, it was given decent Attack and Close Combat to deny Blissey, the pink blob of choice in Gen 4 (pre-Eviolite). Not only is this concept now banned due to Baton Pass Clause, but also Togekiss is not a great Pokemon in standard play, and as we've seen with it and Volkraken, "partner" concepts are not the best to work with.

However, this does not mean that Voodoom was terrible at its release. While not pairing too well with Togekiss, Voodoom found a great partner in Zapdos, who ran more offensive sets at the time. However, Tapu Koko and Thundurus have taken Zapdos's role from Gen 4, so today, Zapdos finds itself running defensive sets or niche sets like a Tailwind setter on some HO teams.

Voodoom, while not top tier by any means, does not lack redeeming qualities. It still retains the same speed tier as Mega Metagross at 110, which isn't too slow. It's bulk isn't too terrible, sitting at 90 / 80 / 80, meaning it's about as bulky as non-Intimidate Arcanine. It's Special Attack is decent as well, sitting at 105, meaning it's just a little weaker than Celesteela, who has 107 SpA. It's 85 Attack is frankly irrelevant by today's standards, as Chansey isn't OHKOed by Close Combat like Blissey is. Boasting an immunity to Electric is also very nice, giving it a few more opportunities to switch in. It has access to quite decent coverage: Fighting-, Dark-, and Psychic-type coverage is nothing to sneeze at. Memento, Taunt, Vacuum Wave, and Hidden Power Ice are also good moves to run on it.

As it stands now, I don't think salvaging the concept is a viable action. Frankly, trying to have it work with Togekiss would be like trying to get two equally other unviable mons to work together. Even trying to get it work with Zapdos sounds suboptimal given that Voodoom was to run offensive sets and that Zapdos wants to run defensive sets. Therefore, I think working off of established metagame role, which is a fast balance breaker would be best.