I recommend using the non-XP version with Monster XP Addon:
Monster XP
Seymour:

Description:
Summon Monsters from a menu at the closest Enemy to the aim point.
Monsters:
1. Alien Grunt
2. Big Momma
3. Bull Squid
4. Controller
5. Gargantua
6. Head Crab
7. Hound Eye
8. Slave
9. Snark
10. Zombie
Each monster has it's own cool down time
shconfig.cfg CVARs for XP version:
Code:
//Seymour
seymour_level 5
seymour_radius 200 //Distance between aim point and enemy
seymour_agrunt 1 //How many times can he summon an agrunt?
seymour_agrunt_xp 15 //How many XP a player gets when he kills an agrunt?
seymour_agrunt_money 150 //How much money a player gets when he kills an agrunt?
seymour_agrunt_frags 1 //How many frags a player gets for killing an agrunt?
seymour_agrunt_cooldown 5
seymour_bigmomma 1 //How many times can he summon a bigmomma?
seymour_bigmomma_xp 25 //How many XP a player gets when he kills a bigmomma?
seymour_bigmomma_money 250 //How much money a player gets when he kills a bigmomma?
seymour_bigmomma_frags 2 //How many frags a player gets for killing a bigmomma?
seymour_bigmomma_cooldown 7
seymour_bullsquid 2 //How many times can he summon a bullsquid?
seymour_bullsquid_xp 5 //How many XP a player gets when he kills a bullsquid?
seymour_bullsquid_money 50 //How much money a player gets when he kills a bullsquid?
seymour_bullsquid_frags 0 //How many frags a player gets for killing a bullsquid?
seymour_bullsquid_cooldown 2
seymour_controller 1 //How many times can he summon a controller?
seymour_controller_xp 15 //How many XP a player gets when he kills an controller?
seymour_controller_money 150 //How much money a player gets when he kills an controller?
seymour_controller_frags 1 //How many frags a player gets for killing an controller?
seymour_controller_cooldown 5
seymour_gargantua 1 //How many times can he summon a gargantua?
seymour_gargantua_xp 50 //How many XP a player gets when he kills an gargantua?
seymour_gargantua_money 500 //How much money a player gets when he kills an gargantua?
seymour_gargantua_frags 3 //How many frags a player gets for killing an gargantua?
seymour_gargantua_cooldown 10
seymour_headcrab 3 //How many times can he summon a headcrab?
seymour_headcrab_xp 3 //How many XP a player gets when he kills a headcrab?
seymour_headcrab_money 30 //How much money a player gets when he kills a headcrab?
seymour_headcrab_frags 0 //How many frags a player gets for killing a headcrab?
seymour_headcrab_cooldown 1
seymour_houndeye 2 //How many times can he summon a houndeye?
seymour_houndeye_xp 5 //How many XP a player gets when he kills a houndeye?
seymour_houndeye_money 50 //How much money a player gets when he kills a houndeye?
seymour_houndeye_frags 0 //How many frags a player gets for killing a houndeye?
seymour_houndeye_cooldown 2
seymour_islave 2 //How many times can he summon a islave?
seymour_islave_xp 10 //How many XP a player gets when he kills an islave?
seymour_islave_money 100 //How much money a player gets when he kills an islave?
seymour_islave_frags 1 //How many frags a player gets for killing an islave?
seymour_islave_cooldown 2
seymour_snark 5 //How many times can he summon a snark?
seymour_snark_xp 1 //How many XP a player gets when he kills a snark?
seymour_snark_money 10 //How much money a player gets when he kills a snark?
seymour_snark_frags 0 //How many frags a player gets for killing a snark?
seymour_snark_cooldown 0
seymour_zombie 2 //How many times can he summon a zombie?
seymour_zombie_xp 10 //How many XP a player gets when he kills a zombie?
seymour_zombie_money 100 //How much money a player gets when he kills a zombie?
seymour_zombie_frags 1 //How many frags a player gets for killing a zombie?
seymour_zombie_cooldown 3
//To disable a monster change the seymour_"monstername" to -1
shconfig.cfg CVARs for non-XP version:
Code:
//Seymour
seymour_level 5
seymour_radius 200 //Distance between aim point and enemy
seymour_agrunt 1 //How many times can he summon an agrunt?
seymour_agrunt_cooldown 5
seymour_bigmomma 1 //How many times can he summon a bigmomma?
seymour_bigmomma_cooldown 7
seymour_bullsquid 2 //How many times can he summon a bullsquid?
seymour_bullsquid_cooldown 2
seymour_controller 1 //How many times can he summon a controller?
seymour_controller_cooldown 5
seymour_gargantua 1 //How many times can he summon a gargantua?
seymour_gargantua_cooldown 10
seymour_headcrab 3 //How many times can he summon a headcrab?
seymour_headcrab_cooldown 1
seymour_houndeye 2 //How many times can he summon a houndeye?
seymour_houndeye_cooldown 2
seymour_islave 2 //How many times can he summon a islave?
seymour_islave_cooldown 2
seymour_snark 5 //How many times can he summon a snark?
seymour_snark_cooldown 0
seymour_zombie 2 //How many times can he summon a zombie?
seymour_zombie_cooldown 3
//To disable a monster change the seymour_"monstername" to -1
Requirements:
-MonsterMod
-engine
-cstrike
-fakemeta
-hamsandwich (XP version only)
Updates:
Version 1.0:
-Hero Created
Version 1.1:
-Better Menu
-Can change cvars "seymour_monstername" to -1 or below to disable and remove monster from menu
Version 2.0:
-Bug Fixed: Monster Times don't reset on new spawn
-THE BIG UPDATE: Now Monsters give XP, Money and Frags all controlled by CVARS 
-The reason I used "cs_set_user_deaths(idattacker, cs_get_user_deaths(idattacker))" is to update the scoreboard 
Version 2.1:
-Made two versions:
1. XP version is used when Monster XP Addon is not installed
2. Non-XP version is used when Monster XP Addon is installed
NOTE: Needs Monster Mod to work ( Here )
WARNING: Precaching lots of monsters might cause a server crash so don't use all the 10 at 1 time