Neptuna (Milesprower2)

Overview
The Poseidon Zombie is the boss of Misty Pond in Plants vs. Zombies: The Final Showdown. It has various water-based attacks, and can summon zombies by turning water into them. There's no mist like there is in most levels of this stage, but that doesn't mean this is any easier. As with all bosses in Plants vs. Zombies: The Final Showdown, the battle is divided into three phases.

Phase 1
It will stand on water in the rightmost column, transforming water into zombies at a steady rate, and every 30 seconds it will perform an attack at random, as well as changing rows. In this phase, it can only use Water Wall and Aqua Tornado. Every sixth zombie will carry Plant Food. After taking 750nds of damage, phase 2 will begin.

Phase 2
This phase is similar to phase 1, except that Poseidon will sometimes summon a pair of zombies, not just one. It can also use the Huge Wave attack in this phase, and attacks every 27 seconds instead of every 30 seconds. Every eighth zombie will carry Plant Food. Deal 750nds to enter the final phase.

Phase 3
In phase 3, it will attack every 24 seconds, and it now uses all of his attacks, plus Huge Wave is more powerful. Every tenth zombie will carry Plant Food. It takes a further 1,000nds to finish Poseidon off.

Attacks
Aside from summoning zombies made out of water, these are the attacks Poseidon Zombie can do.

Water Wall
Produces a wall of water in the middle column, blocking 100nds of damage from plants and destroying any plants in that column. 75% chance to do this in phase 1, 50% chance to do this in phase 2 and 30% chance to do this in phase 3.

Aqua Tornado
Uses a tornado made out of water to destroy all plants and zombies in a random 3x3 area. 25% chance to do this in phase 1 and 2 and a 20% chance to do this in phase 3.

Huge Wave
A massive wave comes crashing down on two columns of plants, or three during the third wave, and destroys all of said plants. It can't hit plants any further than the fourth column from the left though. 25% chance to do this in phase 2 and a 20% chance to do this in phase 3.

Aqua Army
Summons ten random Ducky Tube Zombies simultaneously. This can be very dangerous, but is only used during the third phase. It has a 30% chance of being used.

Plants
A list of the plants, along with the chance of them appearing on the conveyor-belt.
 * Lily Pad (40%)
 * Kernel-pult (15%)
 * Fume-shroom (15%)
 * Wall-nut (10%)
 * Split Pea (10%)
 * Ice-shroom (5%)
 * Volt-shroom (5%)

Zombies
A list of all the zombies, along with the chance of them spawning in each phase. The first percentage is the chance of the zombies spawning in Phase 1. The second percentage is the chance of them spawning in Phase 2, and the third percentage is the chance of them spawning in Phase 3. Note: The first three zombies that spawn in Phase 1 will always be Ducky Tubers, and the next two will be Seagulls, then a Conehead and a Buckethead. After that, it's random.
 * Ducky Tube Zombie (30%, 20%, 10%)
 * Ducky Tube Conehead Zombie (20%, 15%, 10%)
 * Ducky Tube Buckethead Zombie (10%, 15%, 20%)
 * Snorkel Zombie (10%, 10%, 10%)
 * Dolphin Rider Zombie (5%, 10%, 15%)
 * Seagull Zombie (10%, 10%, 5%)
 * Scuba Diving Zombie (0%, 5%, 10%)
 * Siren Zombie (5%, 5%, 7%)
 * Mer-Zombie (0%, 5%, 6%)
 * Zomanha (0%, 5%, 7%)
 * Kraken Zombie (spawns after it loses half of its health in Phase 3)

Rewards

 * Flower Pot
 * If you don't lose any Lawnmowers, then you get a Star

Boss Rush Mode
Details about the fight in Boss Rush.

Time Attack
Time Limit: Phase 1: 2:30. Phase 2: 3:00. Phase 3: 6:00.

Last Stand
Starting Sun: 6,000.

Reward for Phase 1: 1,500 Sun.

Reward for Phase 2: 1,500 Sun.

Restricted Plants: Sun Producing Plants, free Plants, Bee Tree, Cuke, Angry Bee Tree.

Choose Your Seeds
The boss will show up after a minute, spawning zombies at half the normal speed for the next minute, then it performs an attack and begins spawning zombies and using attacks at the normal speed.

Restricted Plants: Cuke.

Leafy Hell
A list of the Zombies that will spawn in Leafy Hell Mode.

The first percentage is the chance of the zombies spawning in Phase 1. The second percentage is the chance of them spawning in Phase 2, and the third percentage is the chance of them spawning in Phase 3.
 * Ducky Tube Zombie (30%, 20%, 10%)
 * Ducky Tube Conehead Zombie (20%, 15%, 10%)
 * Ducky Tube Buckethead Zombie (10%, 15%, 20%)
 * Snorkel Zombie (10%, 9%, 8%)
 * Dolphin Rider Zombie (5%, 9%, 13%)
 * Seagull Zombie (10%, 7%, 4%)
 * Scuba Diving Zombie (0%, 5%, 10%)
 * Siren Zombie (5%, 5%, 6%)
 * Mer-Zombie (0%, 5%, 6%)
 * Zomanha (0%, 5%, 6%)
 * Speedboat Zombie (0%, 3%, 4%)
 * Boat Gargantuar and Swimming Imp (0%, 2%, 3%)
 * Kraken Zombie (spawns after it loses half of its health in Phase 3)