As Karxrida said, flavor text is exactly why there are seemingly double Abilities.
So, with 11 sets of sort of exact copies Abilities why did Cacophony get dummied out? Once again, flavor text. Here's the definition of Cacophony:
If Cacophony was meant to make the user immune to Sound-based moves than my guess the idea would be the Pokemon is able to create enough noise itself it'll deafen/absorb the attack (like maybe Loudred and Exploud would get it). But Soundproof just means the Pokemon is immune to sound and if a Pokemon is able to create loud enough noise to deafen/absorb sound based moves it'll have to be soundproof to not hurt itself anyway.
stage7_4 has an interesting theory with it maybe meant to be a powering-up move and honestly if that was the case I don't see why they removed it (even if the move doesn't do damage many sound based status moves only has a percentage of working or lowered accuracy). Maybe they considered it would make sound based moves too powerful (a more accurate Sing and Grass Whistle? And some gimmicky sound based moves can get really high in Power as is).
Insomnia: The Pokemon generally have heightened senses; they can't sleep because their mind is getting tons of stimuli thus constantly active.
Vital Spirit (jp. Willingness): The Pokemon generally is one you would considered strong willed and/or stubborn; they can't sleep because they don't want to.
Sweet Veil: The Pokemon releases energy that makes Pokemon awake and active, like they're on a sugar high.
Vital Spirit (jp. Willingness): The Pokemon generally is one you would considered strong willed and/or stubborn; they can't sleep because they don't want to.
Sweet Veil: The Pokemon releases energy that makes Pokemon awake and active, like they're on a sugar high.
Huge Power (jp. Muscleman): I would actually consider this the "generic" version of this Ability. It gives the idea the Pokemon's muscles are highly developed for what you would normally considered "normal" for a creature like it. That's why the Marill family, Mega Mawile, and the Bunnelby family get it (do you expect rabbits and a fairy to be super strong?) and the Machop family doesn't (they're Fighting-types based on bodybuilders, you expect them to be muscular).
Pure Power (jp. Yoga Power): The Japanese name says it all, you get this from doing yoga which the Meditite family does. Well I guess the idea is that the Pokemon reaches a spiritual revelation/high that allows them to unleash their full potential.
Pure Power (jp. Yoga Power): The Japanese name says it all, you get this from doing yoga which the Meditite family does. Well I guess the idea is that the Pokemon reaches a spiritual revelation/high that allows them to unleash their full potential.
Plus & Minus: A difficult one to peg down. Originally only used by Plusle and Minun to power up each other in Double Battles, it was changed so you can have two the same ones and more Pokemon were given them. I could say Plus Pokemon generate positive charged currents and Minus generate negative charged currents but that really doesn't explain much. I can see sort of a vague pattern like Pokemon with Plus being or having something that's red or a shade of red (Mareep the only exception, getting it due to its evolutions) while Pokemon with Minus are or have something that's blue. The Klink family gets both because Klinklank has a red and blue gear (and they could probably generate both currents of electricity depending what way they're spinning).
Rough Skin: The Pokemon's skin/scales is hard and positioned in a way that they cut what rubs against it. Its also a reference to shark's scales which are as I described which is why all the shark-like Pokemon have it, odd one being out is Druddigon though it still makes sense being its based on a dragon (has scales) and gargoyle (hard as stone).
Iron Bards (jp Steel Thorns): The Pokemon has spikes made of metal sticking out of its body. Pretty much only the Ferroseed family can have this Ability unless they decide not to be so literal with it.
Iron Bards (jp Steel Thorns): The Pokemon has spikes made of metal sticking out of its body. Pretty much only the Ferroseed family can have this Ability unless they decide not to be so literal with it.
Air Lock: The Pokemon stops the air from moving, halting all weather.
Cloud Nine (jp No Weather): One thing to note is that this Ability is actually a pun in Japan. Not only does it mean "no weather" (no tenki) but it can also mean "carefree" (notenki). This is why the Psyduck family originally got it though later on so did others probably to have more weather clearers. Anyway back to flavor, this one gives the idea the Pokemon is causing the weather to move on.
Cloud Nine (jp No Weather): One thing to note is that this Ability is actually a pun in Japan. Not only does it mean "no weather" (no tenki) but it can also mean "carefree" (notenki). This is why the Psyduck family originally got it though later on so did others probably to have more weather clearers. Anyway back to flavor, this one gives the idea the Pokemon is causing the weather to move on.
Mold Breaker (jp. Mold-Breaking): Generally the Pokemon look to have a way it can pierce through something.
Terravolt (jp Terravoltage) & Turboblaze: I think the idea is that the Pokemon just overloads the opponent with either electricity or fire.
Terravolt (jp Terravoltage) & Turboblaze: I think the idea is that the Pokemon just overloads the opponent with either electricity or fire.
Filter: Tough to pin down, it might have two meanings. For the Psychic-types, Pokemon who's weaknesses are based on the three common fears (darkness, ghosts, and bugs), it could be the Pokemon is concentrating on not letting its phobia get the better of it. For Mega Aggron it could be that its literally filtering the attack and preventing a chunk of it from affecting it.
Solid Rock (jp Hard Rock): The rock that makes up the Pokemon is very hard that it can withstand against damage done by weaknesses.
Solid Rock (jp Hard Rock): The rock that makes up the Pokemon is very hard that it can withstand against damage done by weaknesses.
Shadow Tag (jp Stepping on Shadows): The Pokemon uses supernatural powers to hold down the opponent's shadow, making the opponent unable to get away.
Arena Trap (jp Antlion): The Pokemon digs a sink hole making escape for non-flying/levitating opponent impossible.
Arena Trap (jp Antlion): The Pokemon digs a sink hole making escape for non-flying/levitating opponent impossible.
White Smoke: The Pokemon releases any negative effect put onto it as a white smoke. Alternatively the white smoke has cleansing/medicinal properties.
Clear Body: The Pokemon's body is extra smooth that negative effects can't stick and slide off.
Clear Body: The Pokemon's body is extra smooth that negative effects can't stick and slide off.
Heatproof: The metal the Pokemon is made of is tempered to withstand high temperatures.
Thick Fat: Sort of half similar. The Pokemon's fat reserves keeps the Pokemon warm from cold Ice-type attacks and decrease the damage from Fire-type attacks by burning off calories instead.
Thick Fat: Sort of half similar. The Pokemon's fat reserves keeps the Pokemon warm from cold Ice-type attacks and decrease the damage from Fire-type attacks by burning off calories instead.
Battle Armor (jp. Kabuto Armor): The Pokemon who have this armor has some kind of natural external protection such as a exoskeleton or a bony helmet.
Shell Armor: Pokemon has a shell.
Shell Armor: Pokemon has a shell.
So, with 11 sets of sort of exact copies Abilities why did Cacophony get dummied out? Once again, flavor text. Here's the definition of Cacophony:
a harsh, discordant mixture of sounds.
If Cacophony was meant to make the user immune to Sound-based moves than my guess the idea would be the Pokemon is able to create enough noise itself it'll deafen/absorb the attack (like maybe Loudred and Exploud would get it). But Soundproof just means the Pokemon is immune to sound and if a Pokemon is able to create loud enough noise to deafen/absorb sound based moves it'll have to be soundproof to not hurt itself anyway.
stage7_4 has an interesting theory with it maybe meant to be a powering-up move and honestly if that was the case I don't see why they removed it (even if the move doesn't do damage many sound based status moves only has a percentage of working or lowered accuracy). Maybe they considered it would make sound based moves too powerful (a more accurate Sing and Grass Whistle? And some gimmicky sound based moves can get really high in Power as is).