[Konstantinos]

You cannot rely on i as a report may or may not be valid according to what you said. So you will need a counter variable.

pawn Код:

new counter = -1;
for (new i; i < MAX_REPORTS; ++i)
{
    if (Reports[i][reportValide])
    {
        string = "Report: ";
        strcat(string, Reports[i][reportDetails]);

        SCM(playerid, ++counter % 2 ? COLOR_BLUE : COLOR_YELLOW, string);
    }
}