Name: Encore
Type: Normal.
PP: 8.
Effect: The target repeats its last move for 4 turns.
Distribution: Current Adv distribution and Primeape, Dragonite, Mew, Sableye, Banette, Chimecho, Donphan, Gardevoir, Granbull, Grumpig, Jynx, Ludicolo, Meganium, Ninetales, Poliwrath, Politoed, Volbeat, Illumise, Wigglytuff and Snorlax.
Reasoning: Encore is a very niche move in Adv, with very few users. The most notable of those are Wobbuffet and Victreebel. In vanilla Adv, that is ok, because Encore is pretty devastating and variable, as it can last from 2 to 6 turns. So, my changes make it less RNG, with it now always lasting 4 turns. Apart from that, I included a lot of Mons that learn the move in future Gens (but not all of them, Gengar for example would be too strong). Most of the Mons right now would be bad in a Ubers Metagame, but there are some exceptions:
-Mew can use Encore to help itself use SD when facing some passive team.
-Snorlax can win mirrors vs other Snorlax. Apart from that, not much use for him, but its already a great Mon.
-Banette and Sableye can switch into many Snorlax moves and force it out.
-Ludicolo can switch into all Kyogre moves except TW, Thunder and IB (unless defensive Ludicolo), and lock it into something like CM or Surf.
-Politoed and Poliwrath can switch into slow variants of Kyogre and do the same thing.
-Ninetales can switch into Sacred Fire from Ho-oh and disrupt it too. Its a pretty lackuster Mon otherwise, but this is a real niche.
-Dragonite can switch into Groudon's EQ and force it out.
To sum it up, Encore relevance grows with these changes, but it still won,t be dominant, cause most Mons are mediocre.
Name: Dragon Tail.
Type: Dragon.
Power: 60.
Accuracy: 90
PP: 16.
Effect: Forces the target to switch into a random ally. User moves last.
Distribution: Groudon, Salamence, Charizard, Dragonite, Gyarados, Aggron, Ampharos, Arbok, Dunsparce, Feraligatr, Flygon, Meganium, Milotic, Nidoking, Nidoqueen, Sceptile, Seviper, Steelix, Slowking, Tropius, Rhydon.
Reasoning: Dragon Dance and Dragon Claw are the only Dragon moves that are used in Gen 3. This is a new one, a way to abuse Spikes and prevent set-up. Its different from Roar, since its immune to Taunt and prevents Superman teams/cores from endlessly switching, since it does damage. Main users are going to be Groudon, Salamence, Gyarados and Flygon, but who knows, maybe someone finds a niche for other Mons in the list.
Name: Razor Leaf.
Type: Grass.
Power: 55
Accuracy: 95
Effect: This move always crits.
Distribution: Current Adv distribution, Shiftry, Roselia and Farfetch'd.
Removed from: Abomasnow.
Reasoning: Welcome to RBY! Just like in RBY, this move always crits, though now it does not depend on user's Speed, so Mons like Vileplume can use it too. Vileplume is not the target of the move though, since its still unviable. Targets are the better Grass types: Victreebel and Shiftry now don,t depend on Solar Beam as much (though its still a little stronger), while Ludicolo can ignore opposing Kyogre's CM boosts. The move annoys specifically Kyogre, Groudon and Tyranitar. For this reason, I removed it from Abomasnow, who already checks Kyogre well and removes the other weathers (if used with Dugtrio, Abomasnow can switch into Tyranitar, die and win the weather war). Venusaur, Bellosom (who unlike Victreebel resists Ground and is bulkier than Shiftry) and Tropius might get a small niche for learning the move.