Ability Guide

(If you have anything to contribute, PM me and I'll decide if it's good enough!)
A
Adaptability: A Pokémon's happiness will only decrease by half when it does decrease.

Aftermath: If another Pokémon in your party's happiness decreases, the Pokémon with Aftermath will also lose the same amount of happiness.

Air Lock: Weather won't decrease happiness.

Anger Point: If happiness is below 20, the Pokémon's happiness will automatically drop to 0.

Anticipation: Every time you check your stats and modify this Pokémon's stats, its happiness will increase by 5.

Arena Trap: When the Pokémon with Arena Trap is put into a PC box, when it comes out, its happiness will drop to 5.

B
Bad Dreams: Reduces happiness by 20 overnight.

Battle Armor: This Pokémon is protected from any abilities which may drop his/her happiness.

Blaze: The Pokémon's happiness will increase by 10 if in a fire-type environment.

C
Clorophyll: If it's a sunny day where you live, that day, your Pokémon's happiness will increase by 10.

Clear Body: Happiness changes are made the opposite. Increases in happiness will decrease happiness and decreases of happiness increase happiness.

Cloud Nine: All weather abilities of all Pokémon in your party are negated.

Color Change: Same as Cloud Nine.

Compoundeyes: Quarter the increase and decrease of happiness and the number you get is the number of how much your happiness will increase or decrease.

Cute Charm: The first member in the party who is the opposite gender's ability will be negated.

D
Damp: All Fire-type Pokémon in the party will have their abilities negated.

Download: The happiness of the Pokémon will never change, it will stay at 50 forever.

Drizzle: It will always rain.

Drought: It will always be sunny.

Dry Skin: Nothing happens.

E
Early Bird: Happiness increases by 5 if you are up early in the morning.

Effect Spore: All abilities are negated.

F
Filter: Other Pokémon's abilities which effect the user have their effects turned to the opposite and used.

Flame Body: It is sunny all the time for the whole party.

Flash Fire: It is sunny for 2 days if it is actually sunny for one day in real life.

Forecast: Changes forms on the weather, and any abilities that change weather don't do anything to the Pokémon with Forecast.

Forewarn: If you change this Pokémon's stats, its happiness will decrease by 1.

Frisk: Every day, you lose 1 item.

G
Gluttony: Happiness goes to 0 if this Pokémon isn't fed three times a day.

Guts: This Pokémon's happiness decreases by 5 every time it eats a berry.

H
Heatproof: All abilities that trigger sunlight are negated.

Honey Gather: 5 jars of honey will appear in your bag each day.

Huge Power: This Pokémon cannot be in the party with any other Pokémon.

Hustle: All Pokémon's happiness decreases by 5 at night.

Hydration: Instantly evolves if it rains.

Hyper Cutter: This Pokémon can only have its happiness increased by other abilities.

I
Ice Body: If it is snowy or hailing, this Pokémon will get full happiness (100 happiness).

Illuminate: Decreases the entire party's happiness by 10 overnight.

Illusion: The entire party's happiness decreases by 5 every day due to confusion.

Immunity: This Pokémon cannot be released.

Inner Focus: Happiness decreases by 5 every week.

Insomnia: Happiness decreases by 10 every night.

Intimidate: Other party members will lose 10 happiness for the first week this Pokémon is in your party.

Iron Fist: This Pokémon has a high chance of breaking out of its Pokéball and running away.