Something that is common to Pokémon species and the games they appear in is that they use moves of all different kinds and types. Of course, not all of these moves have good results, and some of their necessary qualities are questionable. Yet the fact of the matter is that some of these moves can truly be the keys to victory, and those would be considered good and necessary. Those moves are then the subject of this discussion with regard to their properties and in particular their execution.
Quite a few of these moves are big and explosive - in fact, most (moves that are) Charged attacks in Pokémon Go are like that, and they often finish up a battle with a victor for the side that used one. As for the moves that actually bear these characteristics, being Self-Destruct and Explosion, they may only rarely get their use as finishing ones and in particular winning ones due to their effects, but they might just work out that way in some rare situations. In either case, things may just work out.
Moves that become winning moves, however, may just result in that way as a result of other moves - perhaps, through a "calculated" approach. Dream Eater as a successful winning move would require a cascade of earlier moves that result in a Sleep status for the one the move is inflicted on. More broadly, some winning moves may be the way they are due to stat changes, like those from Flame Charge as a direct contributor or Acid Spray as an indirect one instead. The process is then just as important as the move.
Then, there is a saying out there that a winning move may not be to make any move, which is a respectable manner for certain contexts that involve specific conflicts. In the main series, HP drain of a defending Pokémon by a status might just be the crux of a victory if an attacking Pokémon chooses to go defensive instead. By and large, though, moves have to be made in Pokémon battles, and something eventually has to give, resulting in definite wins and losses that the moves make to happen in their ways.
Whether the moves are good or necessary (or both), they essentially become, well... "essential" to the turnouts in Pokémon battles and in particular for a victorious one. They still depend on their properties to result in massive outright damage, minor "calculated" damage, or even just "collateral" damage, possibly among other situations as well. It's certain that Pokémon species will have their moves, and that much can be depended on, even if the results of the battles themselves may not be as dependable.
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