In all seriousness, Renamon is only a rookie level digimon, which are generally comparable to weaker pokemon in terms of power level. Especially considering Lucario's typing and movepool, it'd be closer to a fair fight against Kyubimon.
General rule of thumb in terms of scale for comparing the two franchises:
Rookie = Most bottom and mid evo's, anything that isn't a complete shitmon
Champion = Some stronger mid-evo's and most fully evolved pokemon, weaker mega evolutions.
Ultimate = Pseudolegends, most mega evolutions, lower-tier legendary and mythical pokemon.
Mega = Pretty much only box legends can match the sheer power levels that Mega-level Digimon can fight at.