Nidoqueen

Type Tier
Poison / Ground BL
Statistics
Stat
HP
90
383
Atk
82
262
Def
87
272
SpA
75
248
SpD
85
268
Spe
76
250
Name Item

Standard Nidoqueen

Leftovers
Moveset
~ Earthquake
~ Lovely Kiss
~ Thunder / Thunderbolt
~ Ice Beam / Fire Blast

This runs on the same principle as Nidoking, only difference is it doesn't hit as hard. The two moves are standard, the other slots are just picking what you need on your team / like to use. Earthquake gives a nice powerful STAB attack. Lovely Kiss lets you sleep those annoying Waters and what-not. Thunder and Thunderbolt help annoy Starmie and Suicune, and the last move is just a filler for your team.

Other Options

You can pseudo-pass Reflect. Nidoqueen can Charm for countering Cursers. Counter could be interesting for sending back non-STAB Earthquakes.

Opinion

Nidoqueen is whatever you want it to be. Really, Nidoqueen is used to fill in gaps in a team, and to be played defensively (given its typing). Nidoqueen is a great Pokémon with a nice typing (immune to Electric, 4x resistant to Poison, and 2x resistant to Fighting, Bug, and Rock). Sure, a few of its weaknesses are pretty common, but everything has weaknesses. Nidoqueen could work in standard play, given its resistance to Thunder Wave and Toxic, and its all-around usefulness. You could mix and match the moves above to make it a useful Curse counter. Really, Nidoqueen can fill in almost any role you may need on a team. Nidoqueen's versatility is what makes it so useful and fun to use. Facing one can be annoying though, since there's no standard set, and you never really know what Nidoqueen's going to do to you.

Counters

The most reliable counters can take attacks from both ends of the spectrum without instantly dying, such as Suicune and Porygon2. Hypno and Snorlax (to an extent) also work well. While Alakazam isn't particularly defensive, its extremely powerful Psychic can nearly OHKO Nidoqueen. Depending on the moves present in the set, a variety of Pokemon with super effective moves against Nidoqueen or good defensive capabilities might be viable.