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The Tea item is exclusive to Pokémon FireRed and LeafGreen. It's not possible to obtain the Tea item in Pokémon Diamond or any version that is not FireRed or LeafGreen. The only way to have the Tea item in Pokémon Diamond is via a hack.
Comparative: more exclusive Superlative: most exclusive
Their main diet consists of English Tea bags in the morning, this can be microwaved, oven heated, frozen and blended. This is the only delicacy exclusive to Britain, England.
Exclusive to what?
The suffix word of "exclusive" is "exclusivity."