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The retroflex r is not the consonant r in a word (pinyin) like in 人 rén.
The retroflex is added as a suffix in the Beijing area, or as a diminutive suffix.
Would it be pronounced with the second tone, because 儿 is pronounced ér?
Or would it be pronounced like the previous syllable? Like in 哪儿 it would be pronounced 3rd tone, or 4th tone as in 那儿?
Is there a rule to pronounce that retroflex?
In pinyin erhua is usually written with a natural tone:
r
哪儿, like you mentioned above, for example is written:
nǎr
Erhua is tacked on to the end of the pinyin and the tone is in the usual place for the preceding character.
An easier way to see this is probably for a word like 瓶儿. 瓶儿 is written:
píngr
The erhua is not merged into the pinyin (like you may see in some topolectical Romanizations) but just placed at the end somewhat unsightly. This is because the whole word is read as a whole and not in parts.
