continually undergoes evolutions much like the beloved Pokémon creatures it represents, with new pocket monsters being added to the game regularly, and changing game mechanics.
In a game where players are encouraged to catch them all, it can be frustrating at times to discover that some Pokémon are not so easy to come by, and even then it can be frustratingly difficult to catch some of them. For the most part, the majority of Pokémon in the game will come and go with seasons, events, and even time of day, but there are a few which have even more difficult requirements to find.
Home to a massive variety of Pokémon from all past regions, players run into one particular hardship, whether they are new to the game or longtime fans, which is catching certain Pokémon.
Though the most powerful of the bunch can often be difficult to capture, others, like Sigilyph, earn their rarity by being region-locked to specific countries.
Unless someone is willing to purchase some plane tickets simply to try to catch a Pokémon, or engage in cheating behaviors that could get them banned from the game, collecting them all will simply not be likely to happen.