Hello, I´ve been using this team Zard Y, Kartana, Koko, Reuniclus, Zapdos and Hawlucha and I don´t know if it´s solid enough.
I'm not sure if this is the correct thread for this, but I'll bite:
Zard Y Generally wants to be paired with some very solid Pursuit support and given the Koko+Hawlucha core I'd argue it's a little out of place compared to Zard X, which would fit better on a more offensive team. Koko+Hawlucha is a core that is way better-suited for more offensive teams but your Reuniclus pick goes against this almost completely by being more suited for Balance/Bulky Offense maybe? Zapdos
can run an Agility+Electrium Z set to have a pretty significant offensive presence compared to its bulky but at that point you could probably do better with Thundurus-T. Kartana works on these offensively-inclined teams but it also depends on the set you're running.
Overall, though, we just don't know anything about that team based on your post. We can probably assume Koko is Screens, and we can definitely assume the Zard Y is a standard 3-attacks set with Focus Blast and Solar Beam for coverage. Hawlucha is also a very obvious one because it only really has one set, and Reuniclus might be Double Dance (Acid Armor+CM+Recover+Psychic/Psyshock). But the Zapdos set is a bit more ambiguous because you'd need a Defogger with this team if you're running Zard Y, and Kartana has a handful of sets that look the same in theory but play very differently (Scarf, Band, and SD+Z-move). You'd need to be more specific, and you'd probably need to post it in the RMT area instead of here.