The word Pokémon is always capitalized, as well as the names of Pokémon species. So are nouns starting with "Poké", such as Pokéblock, PokéNav and Poké Flute. Note, however, that there is no one common trend for spelling of words beginning with "Poké" - they can be written as a compound word, with the second part of the word capitalized or uncapitalized, or as two words with the second word capitalized. Also note that this applies to many nouns starting with "Pokémon", such as with Pokémon Trainer.
Items and all words in them are always capitalized; they are considered proper nouns for the purposes of Bulbapedia. "Leftovers", "Escape Rope", or "Water Stone" are all correct as written; a page would not be titled "Water stone". Case should match that of the game text, such as the DeepSeaTooth.
Locations should also be capitalized in a manner consistent with English grammar; Ruins of Alph has the A in Alph always capitalized, while numbered routes, such as Route 101, Route 217, and so on, are proper nouns and must have the R capitalized.
Specific terminology is different; leveling up and legendary Pokémon have a lowercase L, as "starter Pokémon" would have a lowercase "s" (but, of course, a capital P in Pokémon).
Specific types are called "the Water type" and "the Rock type" when used as nouns and "Water-type" and "Rock-type" when used as adjectives, while their subject pages are Water (type) and Rock (type), respectively. Squirtle is a "Water-type" is not correct; Squirtle is a Water type and Squirtle is a Water-type Pokémon are. When linking as an adjective, it is preferred that {{type|Water}} is used rather than {{t|Water}}-type.
The plural of "Pokémon" is "Pokémon", as is the plural of every Pokémon species the same as the singular, much like moose or sheep.
Evolutionary levels should be designated as "unevolved", "first evolution", and "second evolution" for Pokémon that have undergone zero, one, and two evolutions respectively during their development. TCG terminology of "basic Pokémon", "stage 1 Pokémon" and "stage 2 Pokémon" should not spill over into other media, as Pikachu and several other Pokémon are considered basic in the TCG sense, yet are Pokémon that have undergone one evolution in their lifetimes, making them first-evolution Pokémon, more akin to Charmeleon than unevolved Pokémon, which their pre-evolutions are.
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