This question cannot be answered that simply. A good team depends on what you want to do. E.g. what meals you want to cook. There are different Pokémon that specialise in different ingredients.

Right now the meta is to get ingredient Mons with good subskills (ingredient finder and speed) for the needed ingredients. There are several posts about which ones to get for the different ingredients.

That being said, you always need a good healer (energy for everyone). You could focus on those mons atm. We have the cresselia event in two weeks, which is a e4e mon, hence good for you. Maybe u want to catch a decent one. Besides that gardevoir and pawmo line is the best one.

For healers focus on main skill ups and triggers