Pakistan has no legitimate claim to join BRICS other than some petty attempt to gain "parity" with India where possible. It was the economist Jim O'neil who coined the term "BRICS" for emerging nations with high economic growth rates and who he saw would change the economic landscape of the world- Pakistan is none of these thing, it isn't even a member of the G20 for god's sake and won't break the 1TN USD GDP mark for decades!
Pakistan has proven to be disruptive in every international body it shares with India from SAARC to the UN.
What an utter joke, Pakistanis think they have a right to everything just because India has it- grow up children.