Up to today, the highest attainable Combat Power in the game is 6,672, which belongs to both Primal Groudon and Primal Kyogre. However, these forms are temporary, and so are their CP buffs, which will go away right after every battle. The actual top non-Mega-evolved CP is 5,010 and it belongs to Slaking.
Cp Calculator is a free online tool that displays the statistical measure to access the ability of the process to meet the required specifications. BYJU'S online Cp calculator tool makes the calculation faster, and it displays the measure in a fraction of seconds.