Is giratina and Eggy any good pvp?

first off, Giratina's a monster in PvP, dragon breath is super good in ultra league plus its tanky as heck, super spamable 3 bars, Giratina's for PvP what Rayquaza and mewtwo are for raids combined

Not sure about the eggy, haven't seen any machamp or really anything weak to psychic in PvP (a lot of what people use actually resists psychicand/or super effects it, mewtwo, tyranitar, metagross, aforementioned monster giratina) Seed bomb might do well as its a 3 bar and theres a fair number of things weak to grass, tyranitar, kyogre, groudon, blastoise, but also many more that resist it, venasaur, Charizard, the dragons

I'd say Giratina's your best bet, its fantastic in PvP and its also a great pokemon, fantastic stats, moves and now has potential.

Fury cutter is an absolute beast as a move, and leaf blade is one of the best charge moves with 70 damage and only a 35 energy cost. What I'm saying is Septile is light years ahead of Eggy. Not only do many of the main pokemon I'm seeing resist confusion, the psychic typing makes it worst against Tyranitar and SB Mewtwo. You want to take out the Tyranitars everyone is using, Septile is your pokemon.

FC Sceptile is amazing.

For things that don't resist psychic, Confusion Eggy wrecks them. (Mine is maxed, so has little place in the general repetitive Master League)

I've not used Kanto Eggs in PvP, so I can't comment on that, specifically. As MetagrossMaxis said though, Giratina is an absolute beast in PvP. Specifically, in the Ultra league. I often use it as the first Mon in my lineup as it has enough bulk to tank hits from my opponent, allowing me to save my shields for later. Dragon Breath is a quick, powerful move that quickly cuts through opposing Mons, and having access to all 3-bar charge moves allows Giratina to spam them consistently. This puts a lot of pressure on opponents early in the game, often causing them to use up both of their shields on Giratina, leaving them defenseless in the other two matchups. Plus, since Giratina is Dragon/Ghost, often times opponents will use a Dragon or Ghost to counter it, which end up taking SE damage back from Giratina's dragon and ghost moves. Given Giratina's superior bulk, it often outlasts them.

I seriously think Giratina might be my top pick for the Ultra League. It's just so good and I've yet to regret having it on my team, even if my opponent has a Mon out that has the typing advantage over Giratina.