As agreed with Lady Salamence I'll do the Choice Items really quickly before getting back to the rest of the abilities.
Choice Band
[SHORT DESC]
An item to be held by a Pokémon. This headband ups Attack, but allows the use of only one of its moves.
[LONG DESC]
<h2>Description</h2>
<p>The user gains a 50% increase to Attack, but can only use the first move selected until it switches out or has its Choice Band removed. If the Choice Band is replaced with another Choice Item, then the user will not be locked into their original choice. If the user is locked into a non-attacking move and is Taunted, they will Struggle. If a Pokemon obtains a Choice Item after using an attack, they will be locked into that attack.</p>
<h2>Analysis</h2>
<p>Choice Band has had a huge impact on the game - many threats are now suddenly more dangerous because of increased attack strength right off the bat, as opposed to taking a turn to set up. However, the drawback of being able to only choose one attack is a severe one - the wrong move allows an opponent to switch in easily. It can transform fast, nobodies into serious threats, or slow powerhouses into battering rams. Although the drawbacks are difficult to work around, Choice Band still remains a fierce item for an offensive Pokemon. Removing Choice Band removes the boost.</p>
<h2>Location</h2>
<p>Battle Subway, 48BP.</p>
Choice Scarf
[SHORT DESC]
An item to be held by a Pokémon. This scarf boosts Speed, but allows the use of only one of its moves.
[LONG DESC]
<h2>Description</h2>
<p>The user gains a 50% increase to Speed, but can only use the first move selected until it switches out or has its Choice Band removed. If the Choice Scarf is replaced with another Choice Item, then the user will not be locked into their original choice. If the user is locked into a non-attacking move and is Taunted, they will Struggle. If a Pokemon obtains a Choice Item after using an attack, they will be locked into that attack. Removing Choice Scarf removes the boost.</p>
<h2>Analysis</h2>
<p>In a metagame dominated by speed and power, Choice Scarf stands out as one of the top items. Granting an instant boost, it turns many slow powerhouses such as Metagross and Tyranitar into devastating sweepers, and can be thrown onto Pokemon such as Terrakion and Ditto to create the best revenge killers possible. Even being locked into a single attack isn't much of a worry for a revenge killer whose job it is to switch in, attack once, and switch out again. Choice Scarf is a great item to combine with Trick - being able to go amazingly fast and use Trick first, then throwing an item which cripples the opponent is a serious hindrance to their gameplan.</p>
<h2>Location</h2>
<p>Battle Subway, 48BP.</p>
Choice Specs
[SHORT DESC]
An item to be held by a Pokémon. These distinctive glasses boost Sp. Atk but allow the use of only one of its moves.
[LONG DESC]
<h2>Description</h2>
<p>The user gains a 50% increase to Special Attack, but can only use the first move selected until it switches out or has its Choice Band removed. If the Choice Specs is replaced with another Choice Item, then the user will not be locked into their original choice. If the user is locked into a non-attacking move and is Taunted, they will Struggle. If a Pokemon obtains a Choice Item after using an attack, they will be locked into that attack. Removing Choice Specs removes the boost.</p>
<h2>Analysis</h2>
<p>The lesser used Choice item, Choice Specs is still a powerful tool in the right hands. There are less hard-hitting Special Attackers, and even less candidates for an instant boost, but the few Pokemon that can make effective use of Choice Specs do so with fearsome power. Hydreigon, Galvantula, and Chandelure, to name a few, become horrific sweepers with the power of wreck teams when played correctly. Hydreigon in particular with its base 125 Special Attack, STAB Draco Meteor boosted by Choice Specs makes a powerful shoutback to SpecsMence of DP. Even in Ubers and UU, the choices are less than for a Choice Band, but a well places Choice Specs can make all the difference between an OHKO and a 2HKO.</p>
<h2>Location</h2>
<p>Battle Subway, 48BP.</p>