You may use the plural 'Pokémons' as a word for two or more individual games.
The noun 'Pokémon' is a singular, uncountable noun as a word for the company The Pokémon Company International or Pokémon Korea, Inc. which are owned by (in English) Nintendo Company, Ltd.
Bridges is the plural form of bridge.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
The plural form of rung is rungs.
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The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
Sadly, no. The creators of the game forgot to add in the Pokedex, so trading is impossible without GameShark. :(
The plural of "she" is "they", so the plural of "she had" is "they had".