Well it depends what you want. Generally a team should have at least an Attacker, a Special attacker, wall(physical def), sponge(special def), and two more to fill in gaps. Also one should be really fast.
Bronzor perhaps?
The above advice is more for meta battles but i dont see why it wouldnt help in game too.
For what it's worth most of my food related dates are cooking at my or their place. It was well received. First date should be something more casual than dinner/restaurant anyway. Second+ dates can be a bit more intensive, dinner at residence is fun. Music, food, maybe some drinks. Just have some activities in the pocket.