>>478128391/5 designs in Gen 5: (10)
Victini, Servine, Oshawott, Simisear, Panpour, Gurdurr, Sawk, Cottonee, Cobalion, Keldeo
2/5 designs in Gen 5: (22)
Samurott, Simisage, Munna, Woobat, Audino, Palpitoad, Throh, Garbodor, Gothita, Gothitelle, Ducklett, Swanna, Emolga, Karrablast, Beartic, Virizion, Tornadus, Thundurus, Landorus, Keldeo-R, Meloetta, Meloetta-P
3/5 designs in Gen 5: (49)
Snivy, Serperior, Pignite, Dewott, Patrat, Watchig, Stoutland, Pansage, Pansear, Panpour, Tranquill, Blitzle, Zebstrika, Excadrill, Tympole, Seismitoad, Leavanny, Whirlipede, Petilil, Lilligant, Basculin, Scrafty, Sigilyph, Yamask, Minccino, Cinccino, Gothorita, Lampent, Vanillite, Vanillish, Vanilluxe, Deerling, Sawsbuck, Alomomola, Ferroseed, Eelektrik, Cubchoo, Cryogonal, Shelmet, Accelgor, Larvesta, Terrakion, Tornadus-T, Thundurus.T, Landorus-T, Kyurem-B, Kyurem-A, Genesect, Reshiram
4/5 designs in Gen 5: (58)
Emboar, Lillipup, Herdier, Purrloin, Liepard, Musharna, Pidove, Unfezant, Roggenrola, Gigalith, Swoobat, Drilbur, Timburr, Venipede, Whimsicott, Krokorok, Krookodile, Darmanitan, Maractus, Dwebble, Scraggy, Tirtouga, Archen, Archeops, Zorua, Zoroark, Solosis, Duosion, Excavalier, Foongus, Amoonguss, Frillish, Jellicent, Ferrothorn, Klink, Klang, Klinklang, Tynamo, Eelektross, Elgyem, Beheeyem, Litwick, Stunfisk, Mienshao, Druddigon, Golett, Golurk, Pawniard, Bisharp, Braviary, Vullaby, Mandibuzz, Heatmor, Durant, Deino, Zweilous, Kyurem, Zekrom
5/5 designs in gen 5: (23)
Boldore, Conkeldurr, Sewaddle, Swadloon, Scolipede, Sandile, Darumaka, Crustle, Cofagrigus, Tirtouga, Trubbish, Reuniclus, Joltik, Galvantula, Chandelure, Axew, Fraxure, Haxorus, Mienfoo, Bouffalant, Rufflet, Hydreigon, Volcarona
I'd say that's a pretty high average, maybe 4/5? The legendaries suck mostly.