If you own The Sims 3 Ambitions expansion pack, you can have your Sim become an Inventor. After improving your skill and getting more lifetime points, you can access your lifetime wish chart and buy the robot. The robot is like a regular person who needs oil to drink. You need like 70,000 points.
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you know the lifetime rewards >? Well you have to earn 40,000 and then it will become unlocked once you buy it your freind will be delivered .... Oh and whatever gender your sim is that buys it.... the robot will be the same gender
step1- join the science career track
step2- you have to get pretty high up in the science career track
step3- get level 10 gardening skill or use the cheat to make all fruits
available in store
step4- buy life fruits [i think ten or maybe three 'look it up']
step5- collect ten different gems [mostly rare]
step6- find a pink diamond [its easier if you have the gem collector LHR]
step7- get the pink diamond cut into a heart shape [u need to unlock
the heart shape]
step8- go to the junk yard and get A LOT of scraps.
step9- buy an 'inventors work bench'
step10- put all the items listed above in your sim's inventory
step11- click on the bench, then click on 'mystery invention'
then you will make a simbot and if you do that 3 or 4 times you can make a monster.
[oh and sorry if it doesnt work i might of got some details wrong] LoL
or if you doing all of that then just buy the 'my best friend' LHR
[u get a simbot that is your sim's best friend and u can controll the simbot]
hope i helped.