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You can create your own launch file to spawn the robot. For example:

<!-- spawn_robot.launch -->
<launch>
  <!-- Robot pose -->
  <arg name="x" default="0"/>
  <arg name="y" default="0"/>
  <arg name="z" default="0"/>
  <arg name="roll" default="0"/>
  <arg name="pitch" default="0"/>
  <arg name="yaw" default="0"/>

  <param name="robot_description"
         command="$(find xacro)/xacro.py $(find myrobot_description)/urdf/myrobot.urdf.xacro"/>
  <node name="spawn_robot" pkg="gazebo" type="spawn_model"
        args="-urdf -param robot_description -model myrobot
              -x $(arg x) -y $(arg y) -z $(arg z)
              -R $(arg roll) -P $(arg pitch) -Y $(arg yaw)"/>
</launch>

Then you change <include file="$(find pr2_gazebo)/launch/pr2.launch"/> to:

<include file="$(find myrobot_description)/launch/spawn_robot.launch">
  <arg name="x" value="1.0"/>
  <arg name="y" value="1.0"/>
</include>