What chess ELO rating if someone would know all best moves of chess in every play?

Assuming this person knows all of the moves possible in a game of chess; therefore knowing every best move to play (also knowing the fastest checkmate

Assuming this person knows all of the moves possible in a game of chess; therefore knowing every best move to play (also knowing the fastest checkmate to play with) what would his/her rating be?will it be like 10000 or 100000?

or:Assuming this person knows all of the moves possible in a game of chess; therefore knowing every best move to play (also knowing the fastest checkmate to play with) what would his/her rating be?will it be like 10000 or 100000?

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