I think that spikes support is great, bax really loves spikes support and valiant can use it to nab some kos as well, ting lu/samurott H + gholdengo is a pretty tried and true combo
depending on the sets, you might want something that can deal with tusk, moltres and glowking, common defensive mons that can go up against your core
you could also go with a different round and maximize hazard removal so that your own valiant and bax can get in and set up easier, bulky ace is a good mon because it also checks gambit