Dual-boxing refers to running two clients at the same time (of the same game, usually) and controlling them via a single input (usually heavily macro'd). Multi-boxing is the general term applied to more than a single client at a time.
To "properly" dual-box in World of Warcraft, you need two separate accounts. The comment likening naming a dual-boxing character pair to an alt was misinformed.
Dual-Boxing is not forbidden by World of Warcraft's Terms of Service, though those who do the practice are generally disliked by other players, due to their greater presence and combined power level, and the intrinsic PvP nature of the game.
As of 2016, it is possible to trade from the Virtual Console editions of Pokémon Red, Blue, Green and Yellow to the new Pokémon Sun/Moon (Gen 7) via Pokémon Bank.
Unfortunately while Gen 6 (X/Y/OR/AS) is compatible with Pokémon Bank, it is not possible to receive Gen 1 Pokémon in those games.
However, if we're talking about the original Gameboy cartridges, it can't be done. The limits on trading are as follows:
Generation 1 (Red/Blue/Green/Yellow)
↑↓ Both directions
Generation 2 (Gold/Silver/Crystal)
X Trade impossible
Generation 3 (Ruby/Sapphire/Emerald/FireRed/LeafGreen)
↓ One-way only, allows held items
Generation 4 (Diamond/Pearl/Platinum/HeartGold/SoulSilver)
↓ One-way only, no items
Generation 5 (Black/White/Black 2/White 2)
↓ One-way only, no items
Generation 6 (X/Y/Omega Ruby/Alpha Sapphire)
↓? (Unreleased, backwards trading yet to be confirmed, Pokémon Bank currently forbids items)
Generation 7 (Sun/Moon)
There are three main reasons you can't trade between Gen I/II and Gen III:
- The Pokémon data format changed significantly in Gen III, so the two were incompatible.
- The GBA link cable uses a different voltage to the Gameboy link cable. Even though a GBA can play old Gameboy games, it uses different circuitry than when playing GBA games, so the games' link cable functionalities are fundamentally incompatible.
- Even if these weren't an issue, Nintendo never released a product that allowed trade from one to the next.
Best Answer
Though the necessity varies between generations and games, the general idea is that, especially late in the game, you cannot reach certain areas without some of the HM moves: i.e., strength, cut, surf, whirlpool, dive, etc. (Again, the actual requirements vary by game).
An HM slave, then, is a term for a pokemon that is not used for battle but knows one or more of these moves, such that the battle performance of your other 5 pokemon is not diminished by "wasting" one of your 4 attack moves with an HM move (which are generally subpar compared to other, similar, options).